Delete first character of string if it is 0
JavascriptStringJavascript Problem Overview
I want to delete the first character of a string, if the first character is a 0. The 0 can be there more than once.
Is there a simple function that checks the first character and deletes it if it is 0?
Right now, I'm trying it with the JS slice()
function but it is very awkward.
Javascript Solutions
Solution 1 - Javascript
You can remove the first character of a string using substring
:
var s1 = "foobar";
var s2 = s1.substring(1);
alert(s2); // shows "oobar"
To remove all 0's at the start of the string:
var s = "0000test";
while(s.charAt(0) === '0')
{
s = s.substring(1);
}
Solution 2 - Javascript
Very readable code is to use .substring()
with a start set to index of the second character (1) (first character has index 0). Second parameter of the .substring()
method is actually optional, so you don't even need to call .length()
...
TL;DR : Remove first character from the string:
str = str.substring(1);
...yes it is that simple...
Removing some particular character(s):
As @Shaded suggested, just loop this while first character of your string is the "unwanted" character...
var yourString = "0000test";
var unwantedCharacter = "0";
//there is really no need for === check, since we use String's charAt()
while( yourString.charAt(0) == unwantedCharacter ) yourString = yourString.substring(1);
//yourString now contains "test"
.slice()
vs .substring()
vs .substr()
.substr()
EDIT: substr() is not standardized and should not be used for new JS codes, you may be inclined to use it because of the naming similarity with other languages, e.g. PHP, but even in PHP you should probably use mb_substr()
to be safe in modern world :)
Quote from (and more on that in) https://stackoverflow.com/questions/2243824/what-is-the-difference-between-string-slice-and-string-substring > He also points out that if the parameters to slice are negative, they > reference the string from the end. Substring and substr doesn´t.
Solution 3 - Javascript
Example: http://jsfiddle.net/kCpNQ/
var myString = "0String";
if( myString.charAt( 0 ) === '0' )
myString = myString.slice( 1 );
If there could be several 0
characters at the beginning, you can change the if()
to a while()
.
Example: http://jsfiddle.net/kCpNQ/1/
var myString = "0000String";
while( myString.charAt( 0 ) === '0' )
myString = myString.slice( 1 );
Solution 4 - Javascript
The easiest way to strip all leading 0
s is:
var s = "00test";
s = s.replace(/^0+/, "");
If just stripping a single leading 0
character, as the question implies, you could use
s = s.replace(/^0/, "");
Solution 5 - Javascript
You can do it with substring method:
let a = "My test string";
a = a.substring(1);
console.log(a); // y test string
Solution 6 - Javascript
Did you try the substring
function?
string = string.indexOf(0) == '0' ? string.substring(1) : string;
Here's a reference - https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/String/substring
And you can always do this for multiple 0s:
while(string.indexOf(0) == '0')
{
string = string.substring(1);
}
Solution 7 - Javascript
One simple solution is to use the Javascript slice()
method, and pass 1 as a parameter
let str = "khattak01"
let resStr = str.slice(1)
console.log(resStr)
Result : hattak01
Solution 8 - Javascript
var s = "0test";
if(s.substr(0,1) == "0") {
s = s.substr(1);
}
For all 0
s: http://jsfiddle.net/An4MY/
String.prototype.ltrim0 = function() {
return this.replace(/^[0]+/,"");
}
var s = "0000test".ltrim0();
Solution 9 - Javascript
const string = '0My string';
const result = string.substring(1);
console.log(result);
You can use the substring() javascript function.
Solution 10 - Javascript
//---- remove first and last char of str
str = str.substring(1,((keyw.length)-1));
//---- remove only first char
str = str.substring(1,(keyw.length));
//---- remove only last char
str = str.substring(0,(keyw.length));
Solution 11 - Javascript
try
s.replace(/^0/,'')
console.log("0string =>", "0string".replace(/^0/,'') );
console.log("00string =>", "00string".replace(/^0/,'') );
console.log("string00 =>", "string00".replace(/^0/,'') );
Solution 12 - Javascript
String.prototype.trimStartWhile = function(predicate) {
if (typeof predicate !== "function") {
return this;
}
let len = this.length;
if (len === 0) {
return this;
}
let s = this, i = 0;
while (i < len && predicate(s[i])) {
i++;
}
return s.substr(i)
}
let str = "0000000000ABC",
r = str.trimStartWhile(c => c === '0');
console.log(r);
Solution 13 - Javascript
Here's one that doesn't assume the input is a string
, uses substring
, and comes with a couple of unit tests:
var cutOutZero = function(value) {
if (value.length && value.length > 0 && value[0] === '0') {
return value.substring(1);
}
return value;
};
Solution 14 - Javascript
var test = '0test';
test = test.replace(/0(.*)/, '$1');
Solution 15 - Javascript
From the Javascript implementation of trim() > that removes and leading or ending spaces from strings. Here is an altered implementation of the answer for this question.
var str = "0000one two three0000"; //TEST
str = str.replace(/^\s+|\s+$/g,'0'); //ANSWER
Original implementation for this on JS
string.trim():
if (!String.prototype.trim) {
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g,'');
}
}
Solution 16 - Javascript
Another alternative to get the first character after deleting it:
// Example string
let string = 'Example';
// Getting the first character and updtated string
[character, string] = [string[0], string.substr(1)];
console.log(character);
// 'E'
console.log(string);
// 'xample'