Javascript Prototype String - accessing string value

Question

Im trying to Add a few methods to the Javascript String Object. one of the main methods im trying to add is a substring count function

String.prototype.substring_count = function(delimiter){
    return {THIS IS WHAT I NEED THE STRING FOR}.split(delimiter).length;
}

Where do you access the string in the String object?

AmmarCSE · Accepted Answer · 2015-11-02 12:24:55Z

2

Use this. In the documentation, it is mentioned

If the method is on an object's prototype chain, this refers to the object the method was called on

in this case, the string itself

String.prototype.substring_count = function(delimiter){
    return this.split(delimiter).length;
}

console.log('test,123'.substring_count(','));

answered Nov 2, 2015 at 11:59

AmmarCSE

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2 Comments

I thought it was that, I have used prototyping before but i thought it had a certain variable within the String Object thanks anyway.

@JohnHudson, yes, this in a prototype method will refer to the object, in this case,the string itself