CODEWITHSUNDEEP
javascriptregex
Jitender
Jitender

Reputation: 7969

return value from string prototype using javascript

I am using prototype method to replace comma in string but the function giving same string

String.prototype.removeLastComma = function(){
    return this.replace(/,/g, '.');
}

Upvotes: 0

Views: 79

Answers (2)

Minko Gechev
Minko Gechev

Reputation: 25672

String.prototype.removeLastComma = function(){
    return this.replace(/,/g, '.');
}

Works just fine. I guess you're expecting the following effect:

var str = 'foo,bar,baz';
str.removeLastComma();
console.log(str); //foo.bar.baz

Unfortunately, this is not possible because the strings in JavaScript are immutable.

Try this instead:

var str = 'foo,bar,baz';
str = str.removeLastComma();
console.log(str); //foo.bar.baz

NOTE: better call your method "removeCommas" or something like that. Remove last comma means that you're going to remove only the last one.

For removing the last comma you can use the following regular expression:

String.prototype.removeLastComma = function(){
    return this.replace(/,(?=[^,]*$)/, '.');
}

Upvotes: 2

Flixer
Flixer

Reputation: 958

it works fine for me. For a sample implementation see: http://jsfiddle.net/9Hrzp/

String.prototype.removeLastComma = function(){
    return this.replace(/,/g, '.');
}

alert("foo,bar".removeLastComma());

Upvotes: 0

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