.toLowerCase not working, replacement function?

.toLowerCase not working, replacement function?

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?

Answer by Quentin for .toLowerCase not working, replacement function?

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.

Answer by Joe Coder for .toLowerCase not working, replacement function?

var ans = 334 + '';  var temp = ans.toLowerCase();  alert(temp);  

Answer by spender for .toLowerCase not working, replacement function?

.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);  

Answer by 0x499602D2 for .toLowerCase not working, replacement function?

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  

Answer by Guffa for .toLowerCase not working, replacement function?

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();  }  

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