How to quickly and conveniently disable all console.log statements in my code?
JavascriptDebuggingConsoleJavascript Problem Overview
Is there any way to turn off all console.log
statements in my JavaScript code, for testing purposes?
Javascript Solutions
Solution 1 - Javascript
Redefine the console.log function in your script.
console.log = function() {}
That's it, no more messages to console.
EDIT:
Expanding on Cide's idea. A custom logger which you can use to toggle logging on/off from your code.
From my Firefox console:
http://imgur.com/JXLvK.png" />
var logger = function()
{
var oldConsoleLog = null;
var pub = {};
pub.enableLogger = function enableLogger()
{
if(oldConsoleLog == null)
return;
window['console']['log'] = oldConsoleLog;
};
pub.disableLogger = function disableLogger()
{
oldConsoleLog = console.log;
window['console']['log'] = function() {};
};
return pub;
}();
$(document).ready(
function()
{
console.log('hello');
logger.disableLogger();
console.log('hi', 'hiya');
console.log('this wont show up in console');
logger.enableLogger();
console.log('This will show up!');
}
);
How to use the above 'logger'? In your ready event, call logger.disableLogger so that console messages are not logged. Add calls to logger.enableLogger and logger.disableLogger inside the method for which you want to log messages to the console.
Solution 2 - Javascript
The following is more thorough:
var DEBUG = false;
if(!DEBUG){
if(!window.console) window.console = {};
var methods = ["log", "debug", "warn", "info"];
for(var i=0;i<methods.length;i++){
console[methods[i]] = function(){};
}
}
This will zero out the common methods in the console if it exists, and they can be called without error and virtually no performance overhead. In the case of a browser like IE6 with no console, the dummy methods will be created to prevent errors. Of course there are many more functions in Firebug, like trace, profile, time, etc. They can be added to the list if you use them in your code.
You can also check if the debugger has those special methods or not (ie, IE) and zero out the ones it does not support:
if(window.console && !console.dir){
var methods = ["dir", "dirxml", "trace", "profile"]; //etc etc
for(var i=0;i<methods.length;i++){
console[methods[i]] = function(){};
}
}
Solution 3 - Javascript
As far as I can tell from the documentation, Firebug doesn't supply any variable to toggle debug state. Instead, wrap console.log() in a wrapper that conditionally calls it, i.e.:
DEBUG = true; // set to false to disable debugging
function debug_log() {
if ( DEBUG ) {
console.log.apply(this, arguments);
}
}
To not have to change all the existing calls, you can use this instead:
DEBUG = true; // set to false to disable debugging
old_console_log = console.log;
console.log = function() {
if ( DEBUG ) {
old_console_log.apply(this, arguments);
}
}
Solution 4 - Javascript
You should not!
It is not a good practice to overwrite built-in functions. There is also no guarantee that you will suppress all output, other libraries you use may revert your changes and there are other functions that may write to the console; .dir()
, .warning()
, .error()
, .debug()
, .assert()
etc.
As some suggested, you could define a DEBUG_MODE
variable and log conditionally. Depending on the complexity and nature of your code, it may be a good idea to write your own logger object/function that wraps around the console object and has this capability built-in. That would be the right place to do deal with instrumentation.
That said, for 'testing' purposes you can write tests instead of printing to the console. If you are not doing any testing, and those console.log()
lines were just an aid to write your code, simply delete them.
Solution 5 - Javascript
I realize this is an old post but it still pops up at the top of Google results, so here is a more elegant non-jQuery solution that works in the latest Chrome, FF, and IE.
(function (original) {
console.enableLogging = function () {
console.log = original;
};
console.disableLogging = function () {
console.log = function () {};
};
})(console.log);
Solution 6 - Javascript
Just change the flag DEBUG
to override the console.log function. This should do the trick.
var DEBUG = false;
// ENABLE/DISABLE Console Logs
if(!DEBUG){
console.log = function() {}
}
Solution 7 - Javascript
I know you asked how to disable console.log, but this might be what you're really after. This way you don't have to explicitly enable or disable the console. It simply prevents those pesky console errors for people who don't have it open or installed.
if(typeof(console) === 'undefined') {
var console = {};
console.log = console.error = console.info = console.debug = console.warn = console.trace = console.dir = console.dirxml = console.group = console.groupEnd = console.time = console.timeEnd = console.assert = console.profile = function() {};
}
Solution 8 - Javascript
I am surprised that of all those answers no one combines:
- No jquery
- Anonymous function to not pollute global namespace
- Handle case where window.console not defined
- Just modify the .log function of the console
I'd go for this:
(function () {
var debug = false
if (debug === false) {
if ( typeof(window.console) === 'undefined') { window.console = {}; }
window.console.log = function () {};
}
})()
Solution 9 - Javascript
After I searched for this issue aswell and tried it within my cordova app, I just want to warn every developer for windows phone to not overwrite
console.log
because the app will crash on startup.
It won't crash if you're developing local if you're lucky, but submitting in store it will result in crashing the app.
Just overwrite
window.console.log
if you need to.
This works in my app:
try {
if (typeof(window.console) != "undefined") {
window.console = {};
window.console.log = function () {
};
window.console.debug = function () {
};
window.console.info = function () {
};
window.console.warn = function () {
};
window.console.error = function () {
};
}
if (typeof(alert) !== "undefined") {
alert = function ()
{
}
}
} catch (ex) {
}
Solution 10 - Javascript
If you're using IE7, console won't be defined. So a more IE friendly version would be:
if (typeof console == "undefined" || typeof console.log == "undefined")
{
var console = { log: function() {} };
}
Solution 11 - Javascript
This a hybrid of answers from SolutionYogi and Chris S. It maintains the console.log line numbers and file name. Example jsFiddle.
// Avoid global functions via a self calling anonymous one (uses jQuery)
(function(MYAPP, $, undefined) {
// Prevent errors in browsers without console.log
if (!window.console) window.console = {};
if (!window.console.log) window.console.log = function(){};
//Private var
var console_log = console.log;
//Public methods
MYAPP.enableLog = function enableLogger() { console.log = console_log; };
MYAPP.disableLog = function disableLogger() { console.log = function() {}; };
}(window.MYAPP = window.MYAPP || {}, jQuery));
// Example Usage:
$(function() {
MYAPP.disableLog();
console.log('this should not show');
MYAPP.enableLog();
console.log('This will show');
});
Solution 12 - Javascript
If you use Grunt you can add a task in order to remove/comment the console.log statements. Therefore the console.log are no longer called.
Solution 13 - Javascript
If you use Webpack you could use the Terser plugin to completely exclude the console.log
function calls.
This way you can have a clean production app package that will not expose unnecessary information but still have all this info in your debug build.
https://github.com/terser/terser#compress-options
> drop_console (default: false) -- Pass true to discard calls to console.* functions. If you wish to drop a specific function call such as console.info and/or retain side effects from function arguments after dropping the function call then use pure_funcs instead.
minimizer: [
new TerserPlugin({
terserOptions: {
compress: {
pure_funcs: [ 'console.log' ]
}
}
}),
]
Alternatively you can use drop_console: true
to exclude all console calls.
Solution 14 - Javascript
Ive been using the following to deal with he problem:-
var debug = 1;
var logger = function(a,b){ if ( debug == 1 ) console.log(a, b || "");};
Set debug to 1 to enable debugging. Then use the logger function when outputting debug text. It's also set up to accept two parameters.
So, instead of
console.log("my","log");
use
logger("my","log");
Solution 15 - Javascript
I have used winston logger earlier.
Nowadays I am using below simpler code from experience:
-
Set the environment variable from cmd/ command line (on Windows):
cmd setx LOG_LEVEL info
Or, you could have a variable in your code if you like, but above is better.
-
Restart cmd/ command line, or, IDE/ editor like Netbeans
-
Have below like code:
console.debug = console.log; // define debug function console.silly = console.log; // define silly function switch (process.env.LOG_LEVEL) { case 'debug': case 'silly': // print everything break; case 'dir': case 'log': console.debug = function () {}; console.silly = function () {}; break; case 'info': console.debug = function () {}; console.silly = function () {}; console.dir = function () {}; console.log = function () {}; break; case 'trace': // similar to error, both may print stack trace/ frames case 'warn': // since warn() function is an alias for error() case 'error': console.debug = function () {}; console.silly = function () {}; console.dir = function () {}; console.log = function () {}; console.info = function () {}; break; }
-
Now use all console.* as below:
console.error(' this is a error message '); // will print console.warn(' this is a warn message '); // will print console.trace(' this is a trace message '); // will print console.info(' this is a info message '); // will print, LOG_LEVEL is set to this console.log(' this is a log message '); // will NOT print console.dir(' this is a dir message '); // will NOT print console.silly(' this is a silly message '); // will NOT print console.debug(' this is a debug message '); // will NOT print
Now, based on your LOG_LEVEL settings made in the point 1 (like, setx LOG_LEVEL log
and restart command line), some of the above will print, others won't print
Hope that helped.
Solution 16 - Javascript
To disable console.log
only:
console.log = function() {};
To disable all functions that write to the console:
for (let func in console) {
console[func] = function() {};
}
Solution 17 - Javascript
Here is a solution I just worked on that is fairly exhaustive. I covered all the fully supported console methods from https://developer.mozilla.org/en-US/docs/Web/API/console
1. Create js file "logger.js" and put in the following code in it
logger = {
assert: function() {
if(logger.active && logger.doAssert) {
console.assert.apply(null,arguments);
}
},
clear: function() {
if(logger.active && logger.doClear) {
console.clear();
}
},
count: function() {
if(logger.active && logger.doCount) {
console.count.apply(null,arguments);
}
},
countReset: function() {
if(logger.active && logger.doCountReset) {
console.countReset.apply(null,arguments);
}
},
debug: function() {
if(logger.active && logger.doDebug) {
console.debug.apply(null,arguments);
}
},
dir: function() {
if(logger.active && logger.doDir) {
console.dir.apply(null,arguments);
}
},
dirxml: function() {
if(logger.active && logger.doDirxml) {
console.dirxml.apply(null,arguments);
}
},
error: function() {
if(logger.active && logger.doError) {
console.error.apply(null,arguments);
}
},
group: function() {
if(logger.active && logger.doGroup) {
console.group.apply(null,arguments);
}
},
groupCollapsed: function() {
if(logger.active && logger.doGroup) {
console.groupCollapsed.apply(null,arguments);
}
},
groupEnd: function() {
if(logger.active && logger.doGroup) {
console.groupEnd.apply(null,arguments);
}
},
info: function() {
if(logger.active && logger.doInfo) {
console.info.apply(null,arguments);
}
},
log: function() {
if(logger.active && logger.doLog) {
console.log.apply(null,arguments);
}
},
table: function() {
if(logger.active && logger.doTable) {
console.table.apply(null,arguments);
}
},
time: function() {
if(logger.active && logger.doTime) {
console.time.apply(null,arguments);
}
},
timeEnd: function() {
if(logger.active && logger.doTime) {
console.timeEnd.apply(null,arguments);
}
},
timeLog: function() {
if(logger.active && logger.doTime) {
console.timeLog.apply(null,arguments);
}
},
trace: function() {
if(logger.active && logger.doTrace) {
console.trace.apply(null,arguments);
}
},
warn: function() {
if(logger.active && logger.doWarn) {
console.warn.apply(null,arguments);
}
},
active: true,
doAssert: true,
doClear: true,
doCount: true,
doCountReset: true,
doDebug: true,
doDir: true,
doDirxml: true,
doError: true,
doGroup: true,
doInfo: true,
doLog: true,
doTable: true,
doTime: true,
doTrace: true,
doWarn: true
};
2. Include before all your scripts with logs in all pages
3. Replace all "console." with "logger." in your scripts
4. Usage
Used just like "console." but with "logger."
logger.clear();
logger.log("abc");
Finally disable some or all logs
//disable/enable all logs
logger.active = false; //disable
logger.active = true; //enable
//disable some logs
logger.doLog = false; //disable
logger.doInfo = false; //disable
logger.doLog = true; //enable
logger.doInfo = true; //enable
logger.doClear = false; //log clearing code will no longer clear the console.
EDIT
After using my solution for sometime in my latest project I realized that it's difficult to remember that I'm supposed to use logger.
instead of console.
. So for this reason I decided to override console
. This is my updated solution:
const consoleSubstitute = console;
console = {
assert: function() {
if(console.active && console.doAssert) {
consoleSubstitute.assert.apply(null,arguments);
}
},
clear: function() {
if(console.active && console.doClear) {
consoleSubstitute.clear();
}
},
count: function() {
if(console.active && console.doCount) {
consoleSubstitute.count.apply(null,arguments);
}
},
countReset: function() {
if(console.active && console.doCountReset) {
consoleSubstitute.countReset.apply(null,arguments);
}
},
debug: function() {
if(console.active && console.doDebug) {
consoleSubstitute.debug.apply(null,arguments);
}
},
dir: function() {
if(console.active && console.doDir) {
consoleSubstitute.dir.apply(null,arguments);
}
},
dirxml: function() {
if(console.active && console.doDirxml) {
consoleSubstitute.dirxml.apply(null,arguments);
}
},
error: function() {
if(console.active && console.doError) {
consoleSubstitute.error.apply(null,arguments);
}
},
group: function() {
if(console.active && console.doGroup) {
consoleSubstitute.group.apply(null,arguments);
}
},
groupCollapsed: function() {
if(console.active && console.doGroup) {
consoleSubstitute.groupCollapsed.apply(null,arguments);
}
},
groupEnd: function() {
if(console.active && console.doGroup) {
consoleSubstitute.groupEnd.apply(null,arguments);
}
},
info: function() {
if(console.active && console.doInfo) {
consoleSubstitute.info.apply(null,arguments);
}
},
log: function() {
if(console.active && console.doLog) {
if(console.doLogTrace) {
console.groupCollapsed(arguments);
consoleSubstitute.trace.apply(null,arguments);
console.groupEnd();
} else {
consoleSubstitute.log.apply(null,arguments);
}
}
},
table: function() {
if(console.active && console.doTable) {
consoleSubstitute.table.apply(null,arguments);
}
},
time: function() {
if(console.active && console.doTime) {
consoleSubstitute.time.apply(null,arguments);
}
},
timeEnd: function() {
if(console.active && console.doTime) {
consoleSubstitute.timeEnd.apply(null,arguments);
}
},
timeLog: function() {
if(console.active && console.doTime) {
consoleSubstitute.timeLog.apply(null,arguments);
}
},
trace: function() {
if(console.active && console.doTrace) {
consoleSubstitute.trace.apply(null,arguments);
}
},
warn: function() {
if(console.active && console.doWarn) {
consoleSubstitute.warn.apply(null,arguments);
}
},
active: true,
doAssert: true,
doClear: true,
doCount: true,
doCountReset: true,
doDebug: true,
doDir: true,
doDirxml: true,
doError: true,
doGroup: true,
doInfo: true,
doLog: true,
doLogTrace: false,
doTable: true,
doTime: true,
doTrace: true,
doWarn: true
};
Now you can just use console.
as usual.
Solution 18 - Javascript
Warning: Shameless plug!
You could also use something like my JsTrace object to have modular tracing with module-level "switching" capability to only turn on what you want to see at the time.
(Also has a NuGet package, for those who care)
All levels default to "error", though you can shut them "off". Though, I can't think of why you would NOT want to see errors
You can change them like this:
Trace.traceLevel('ModuleName1', Trace.Levels.log);
Trace.traceLevel('ModuleName2', Trace.Levels.info);
Fore more docs, check out the Documentation
T
Solution 19 - Javascript
I found a little more advanced piece of code in this url JavaScript Tip: Bust and Disable console.log:
var DEBUG_MODE = true; // Set this value to false for production
if(typeof(console) === 'undefined') {
console = {}
}
if(!DEBUG_MODE || typeof(console.log) === 'undefined') {
// FYI: Firebug might get cranky...
console.log = console.error = console.info = console.debug = console.warn = console.trace = console.dir = console.dirxml = console.group = console.groupEnd = console.time = console.timeEnd = console.assert = console.profile = function() {};
}
Solution 20 - Javascript
I developed a library for this usecase: https://github.com/sunnykgupta/jsLogger
Features:
- It safely overrides the console.log.
- Takes care if the console is not available (oh yes, you need to factor that too.)
- Stores all logs (even if they are suppressed) for later retrieval.
- Handles major console functions like
log
,warn
,error
,info
.
Is open for modifications and will be updated whenever new suggestions come up.
Solution 21 - Javascript
This should override all methods of window.console. You can put it on the very top of your scripts section, and if you are on a PHP framework you can only print this code when your app environment is production, or if some kind of debug flag is disabled. Then you would have all your logs in your code working on development environments or in debug mode.
window.console = (function(originalConsole){
var api = {};
var props = Object.keys(originalConsole);
for (var i=0; i<props.length; i++) {
api[props[i]] = function(){};
}
return api;
})(window.console);
Solution 22 - Javascript
My comprehensive solution to disable/override all console.*
functions is here.
Of course, please make sure you are including it after checking necessary context. For example, only including in production release, it's not bombing any other crucial components etc.
Quoting it here:
"use strict";
(() => {
var console = (window.console = window.console || {});
[
"assert", "clear", "count", "debug", "dir", "dirxml",
"error", "exception", "group", "groupCollapsed", "groupEnd",
"info", "log", "markTimeline", "profile", "profileEnd", "table",
"time", "timeEnd", "timeStamp", "trace", "warn"
].forEach(method => {
console[method] = () => {};
});
console.log("This message shouldn't be visible in console log");
})();
Solution 23 - Javascript
A simplification of https://stackoverflow.com/a/46189791/871166
switch (process.env.LOG_LEVEL) {
case 'ERROR':
console.warn = function() {};
case 'WARN':
console.info = function() {};
case 'INFO':
console.log = function() {};
case 'LOG':
console.debug = function() {};
console.dir = function() {};
}
Solution 24 - Javascript
I wrote this:
//Make a copy of the old console.
var oldConsole = Object.assign({}, console);
//This function redefine the caller with the original one. (well, at least i expect this to work in chrome, not tested in others)
function setEnabled(bool) {
if (bool) {
//Rewrites the disable function with the original one.
console[this.name] = oldConsole[this.name];
//Make sure the setEnable will be callable from original one.
console[this.name].setEnabled = setEnabled;
} else {
//Rewrites the original.
var fn = function () {/*function disabled, to enable call console.fn.setEnabled(true)*/};
//Defines the name, to remember.
Object.defineProperty(fn, "name", {value: this.name});
//replace the original with the empty one.
console[this.name] = fn;
//set the enable function
console[this.name].setEnabled = setEnabled
}
}
Unfortunately it doesn't work on use strict mode.
So using console.fn.setEnabled = setEnabled
and then console.fn.setEnabled(false)
where fn
could be almost any console function.
For your case would be:
console.log.setEnabled = setEnabled;
console.log.setEnabled(false);
I wrote this too:
var FLAGS = {};
FLAGS.DEBUG = true;
FLAGS.INFO = false;
FLAGS.LOG = false;
//Adding dir, table, or other would put the setEnabled on the respective console functions.
function makeThemSwitchable(opt) {
var keysArr = Object.keys(opt);
//its better use this type of for.
for (var x = 0; x < keysArr.length; x++) {
var key = keysArr[x];
var lowerKey = key.toLowerCase();
//Only if the key exists
if (console[lowerKey]) {
//define the function
console[lowerKey].setEnabled = setEnabled;
//Make it enabled/disabled by key.
console[lowerKey].setEnabled(opt[key]);
}
}
}
//Put the set enabled function on the original console using the defined flags and set them.
makeThemSwitchable(FLAGS);
so then you just need to put in the FLAGS
the default value (before execute the above code), like FLAGS.LOG = false
and the log function would be disabled by default, and still you could enabled it calling console.log.setEnabled(true)
Solution 25 - Javascript
If you're using gulp, then you can use this plugin:
> Install this plugin with the command:
>
> npm install gulp-remove-logging
>
> Next, add this line to your gulpfile:
>
> var gulp_remove_logging = require("gulp-remove-logging");
>
> Lastly, add the configuration settings (see below) to your gulpfile.
>
> Task Configuration
>
> gulp.task("remove_logging", function() {
> return gulp.src("src/javascripts/**/*.js")
> .pipe(
> gulp_remove_logging()
> )
> .pipe(
> gulp.dest(
> "build/javascripts/"
> )
> ); });
Solution 26 - Javascript
One liner just set devMode true/false;
console.log = devMode ? console.log : () => { };
Solution 27 - Javascript
You could use javascript AOP (e.g. jquery-aop) to intercept all calls to console.debug/log (around) and do not proceed with the actual invocation if some global variable is set to false.
You could even do an ajax call (now and then) so you can change the log enabled/disabled behavior on the server which can be very interesting to enable debugging when facing an issue in a staging environment or such.
Solution 28 - Javascript
You can use logeek, It allows you to control your log messages visibility. Here is how you do that:
<script src="bower_components/dist/logeek.js"></script>
logeek.show('security');
logeek('some message').at('copy'); //this won't be logged
logeek('other message').at('secturity'); //this would be logged
You can also logeek.show('nothing')
to totally disable every log message.
Solution 29 - Javascript
After doing some research and development for this problem, I came across this solution which will hide warnings/Errors/Logs as per your choice.
(function () {
var origOpen = XMLHttpRequest.prototype.open;
XMLHttpRequest.prototype.open = function () {
console.warn = function () { };
window['console']['warn'] = function () { };
this.addEventListener('load', function () {
console.warn('Something bad happened.');
window['console']['warn'] = function () { };
});
};
})();
Add this code before JQuery plugin (e.g /../jquery.min.js) even as this is JavaScript code that does not require JQuery. Because some warnings are in JQuery itself.
Thanks!!
Solution 30 - Javascript
I wrote a ES2015 solution ( use only with Webpack ).
class logger {
static isEnabled = true;
static enable () {
if(this.constructor.isEnabled === true){ return; }
this.constructor.isEnabled = true;
}
static disable () {
if(this.constructor.isEnabled === false){ return; }
this.constructor.isEnabled = false;
}
static log () {
if(this.constructor.isEnabled === false ) { return; }
const copy = [].slice.call(arguments);
window['console']['log'].apply(this, copy);
}
static warn () {
if(this.constructor.isEnabled === false ) { return; }
const copy = [].slice.call(arguments);
window['console']['warn'].apply(this, copy);
}
static error () {
if(this.constructor.isEnabled === false ) { return; }
const copy = [].slice.call(arguments);
window['console']['error'].apply(this, copy);
}
}
Description:
- Along with logger.enable and logger.disable you can use console.['log','warn','error'] methods as well using logger class.
- By using logger class for displaying, enabling or disabling messages makes the code much cleaner and maintainable.
- The code below shows you how to use the logger class:
logger.disable()
- disable all console messageslogger.enable()
- enable all console messageslogger.log('message1', 'message2')
- works exactly like console.log.logger.warn('message1', 'message2')
- works exactly like console.warn.logger.error('message1', 'message2')
- works exactly like console.error. Happy coding..
Solution 31 - Javascript
I think that the easiest and most understandable method in 2020 is to just create a global function like log()
and you can pick one of the following methods:
const debugging = true;
function log(toLog) {
if (debugging) {
console.log(toLog);
}
}
function log(toLog) {
if (true) { // You could manually change it (Annoying, though)
console.log(toLog);
}
}
You could say that the downside of these features is that:
- You are still calling the functions on runtime
- You have to remember to change the
debugging
variable or the if statement in the second option - You need to make sure you have the function loaded before all of your other files
And my retorts to these statements is that this is the only method that won't completely remove the console
or console.log
function which I think is bad programming because other developers who are working on the website would have to realize that you ignorantly removed them. Also, you can't edit JavaScript source code in JavaScript, so if you really want something to just wipe all of those from the code you could use a minifier that minifies your code and removes all console.log
s. Now, the choice is yours, what will you do?
Solution 32 - Javascript
To add a bit on top of the other answers, I personally wanted to turn off only specific parts of my code (ES6 modules, but simple separate scripts should work as well).
// old console to restore functionality
const consoleHolder = window.console;
// arbitrary strings, for which the console stays on (files which you aim to debug)
const debuggedHandlers = ["someScript", "anotherScript"];
// get console methods and create a dummy with all of them empty
const consoleMethodKeys = Object.getOwnPropertyNames(window.console).filter(item => typeof window.console[item] === 'function');
const consoleDummy = {};
consoleMethodKeys.forEach(method => consoleDummy[method] = () => {});
export function enableConsoleRedirect(handler) {
if (!debuggedHandlers.includes(handler)) {
window.console = consoleDummy;
}
}
export function disableConsoleRedirect() {
window.console = consoleHolder;
}
Then, just import this module into any file where you want to be able to switch debug mode, call the enable function at the top of the file, and the disable function at the bottom.
If you want to use it in simple scripts, you may want to wrap the top in anonymous functions and/or reorganize it a bit to minimize the namespace pollution.
Additionally, you may want to use just true/false instead of string handler and switch the debug mode in file which you're currently working with.
Solution 33 - Javascript
console.log('pre');
/* pre content */
// define a new console
let preconsole = Object.assign({}, window.console);
let aftconsole = Object.assign({}, window.console, {
log: function(text){
preconsole.log(text);
preconsole.log('log');
}
});
console = aftconsole;
/* content */
console.log('content');
/* end of content */
console = preconsole;
console.log('aft');
Solution 34 - Javascript
When using React you can utilize hooks to manage it so it's limited to the scope of your component
import { useEffect, useRef } from "react";
type LoggingReplacements = {
debug?: typeof console["debug"];
error?: typeof console["error"];
info?: typeof console["info"];
log?: typeof console["log"];
warn?: typeof console["warn"];
};
/**
* This replaces console.XXX loggers with custom implementations. It will restore console log on unmount of the component.
* @param replacements a map of replacement loggers. They're all optional and only the functions defined will be replaced.
*/
export function useReplaceLogging({
debug,
error,
info,
log,
warn,
}: LoggingReplacements): void {
const originalConsoleDebug = useRef(console.debug);
const originalConsoleError = useRef(console.error);
const originalConsoleInfo = useRef(console.info);
const originalConsoleLog = useRef(console.log);
const originalConsoleWarn = useRef(console.warn);
if (debug) {
console.debug = debug;
}
if (error) {
console.error = error;
}
if (info) {
console.info = info;
}
if (log) {
console.log = log;
}
if (warn) {
console.warn = warn;
}
useEffect(() => {
return function restoreConsoleLog() {
console.debug = originalConsoleDebug.current;
console.error = originalConsoleError.current;
console.info = originalConsoleInfo.current;
console.log = originalConsoleLog.current;
console.warn = originalConsoleWarn.current;
};
}, []);
}
Code with tests at https://github.com/trajano/react-hooks/tree/master/src/useReplaceLogging
Solution 35 - Javascript
I found this thread after figuring it out myself. Here's my solution:
const testArray = {
a: 1,
b: 2
};
const verbose = true; //change this to false to turn off all comments
const consoleLog = (...message) => {
return verbose ? console.log(...message) : null;
};
console.log("from console.log", testArray);
consoleLog("from consoleLog", testArray);
// use consoleLog() for the comments you want to be able to toggle.