Javascript int to char and char to int conversion

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Hi Guys,

So sometimes we need ASCII conversions to see what an int value equates to in terms of ASCII char.

Alright here is a quick tip that you can use

int –> char

We will use Javscript’s inbuilt function that is part of String class called fromCharCode  to see an translate an int to char

var i=97;
 console.log(String.fromCharCode(i));
// above line will print a
 
 var i=65;
 console.log(String.fromCharCode(i));
 // above line will print A

A reference to this function can be found here

http://www.w3schools.com/jsref/jsref_fromcharcode.asp

Lets do a complete opposite now

char –> int

We will use Javscript’s inbuilt function that is part of String class called charCodeAt to see an translate an int to char

var chr ='a';
console.log(chr.charCodeAt(0));
// should print 97
var chr ='A';
console.log(chr.charCodeAt(0));
// should print 65

So as you see that its pretty dead simple to do this stuff.

One tip I have for you is that if you are just using

charCodeAt

function on a string length of 1 then you dont need to pass index value. But I found it good practise to use the function the way it is suppose to be used.

So if you don’t want to use index then above can be rewritten as

var ch ='a';
console.log(ch.charCodeAt());
// should still print 97
var ch ='A';
console.log(ch.charCodeAt());
// should still print 65

More information on this function can be found here

http://www.w3schools.com/jsref/jsref_charcodeat.asp

I hope this helps

If I miss something in this post please use comments to add your knowledge that can be shared with many

Cheers,

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