#164 String userfull Functions - Prototype

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#164 √ not_for_core

String userfull Functions

Reported by Claudio Bertarelli | June 12th, 2008 @ 08:53 PM

Object.extend(String.prototype, {
    left : function(n){
        if(n<=0){
            return "";
        } else if(n>this.length){
            return str;
        } else {
            return this.substring(0, n);
        }
    },
    right : function(n){
        if(n<=0){
           return "";
        }else if(n>this.length){
           return str;
        } else {
            return this.substring(this.length, this.length - n);
        }
    }
});

Comments and changes to this ticket

John-David Dalton June 13th, 2008 @ 04:26 AM
Juriy Zaytsev June 13th, 2008 @ 11:11 PM
Could you explain when this is useful?
Both #left and #right are almost identical to a native String.prototype.slice, except that #slice actually knows how to deal with negative argument ;)
```
String.prototype.left = function(n) {
  return n<=0 ? "" : this.slice(0,n);
}

String.prototype.right = function(n) {
  return n<=0 ? "" : this.slice(-n);
}
```
Claudio Bertarelli June 24th, 2008 @ 03:46 PM
I use to ZeroFill a number
and use as my Unique ID
```
    var GlobalIndex = 1;
    myUID = ('000' + GlobalIndex).right(3);
```
Tobie Langel June 30th, 2008 @ 04:44 PM
These are too app specific imho.
Furthermore, for your particular use case, I'd advise using Number#toPaddedString.
```
(255).toPaddedString(4)
// -> "0255"
```