.toLowerCase not working, replacement function?
JavascriptStringLowercaseJavascript Problem Overview
The .toLowerCase
method is giving me an error when I try to use it on numbers. This is what I have:
var ans = 334;
var temp = ans.toLowerCase();
alert(temp);
And then it gives me this error:
'undefined' is not a function (evaluating 'ans.toLowerCase()')
I don't know where I got this wrong. I always thought that numbers can also be parsed, with no change in result (maybe that's where I stuffed up).
But if that's not the error, can someone write a custom makeLowerCase
function, to make the string lower case, perhaps using regex or something?
Javascript Solutions
Solution 1 - Javascript
The .toLowerCase()
function only exists on strings.
You can call .toString()
on anything in JavaScript to get a string representation.
Putting this all together:
var ans = 334;
var temp = ans.toString().toLowerCase();
alert(temp);
Solution 2 - Javascript
Numbers inherit from the Number
constructor which doesn't have the .toLowerCase
method. You can look it up as a matter of fact:
"toLowerCase" in Number.prototype; // false
Solution 3 - Javascript
It's not an error. Javascript will gladly convert a number to a string when a string is expected (for example parseInt(42)
), but in this case there is nothing that expect the number to be a string.
Here's a makeLowerCase
function. :)
function makeLowerCase(value) {
return value.toString().toLowerCase();
}
Solution 4 - Javascript
var ans = 334 + '';
var temp = ans.toLowerCase();
alert(temp);
Solution 5 - Javascript
It is a number, not a string. Numbers don't have a toLowerCase()
function because numbers do not have case in the first place.
To make the function run without error, run it on a string.
var ans = "334";
Of course, the output will be the same as the input since, as mentioned, numbers don't have case in the first place.
Solution 6 - Javascript
const myvar = 222;
const tempVar = myvar.toString().toLowerCase();
alert(tempVar);
Please use the following code because toLowerCase(); is applied on a string so first, you need to convert it into a string by using toString() method
Solution 7 - Javascript
You can use this too.
function strtolower(value){
return ("" + value).toLowerCase();
}
var ans=strtolower( 334);