JavaScript: How can I access the string value of a String object?

Question

I am trying to extend a method to the String prototype.

I want this method to manipulate the string value but I am not sure how do access it.

this the current object context seems to refer to the string object, but not the actual string value.

String.prototype.test = function() { console.log(this)}
function () { console.log(this) }
'lol'.test()
 VM192:2 String {0: "l", 1: "o", 2: "l", length: 3, 
 has: function, contains: function, 
 escapeRegExp: function, camelize: function…
}

How do I access the string value instead of the string object?

The string object is the string, for all practical purposes. What you are seeing in the console is an artifact of some internal machinery combined with how console.log works. In all other contexts, the string object is essentially identical to its primitive value. In this case, in addition to using toString() as suggested in the answers, you can also say this+"" or this.valueOf(). — user663031
– user663031, Commented Jan 6, 2015 at 11:56

Oleksandr T. · Accepted Answer · 2015-01-05 13:07:48Z

5

You need call toString()

String.prototype.test = function() { 
    console.log(this.toString())
}

answered Jan 5, 2015 at 13:07

Oleksandr T.

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antyrat · Accepted Answer · 2015-01-05 13:07:38Z

3

Just call toString method:

console.log( this.toString() )

answered Jan 5, 2015 at 13:07

antyrat

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