How to access argument in javascript function

Question

This is a javascript function:

String.prototype.digit = function() {
  console.log(this); // 'this' contain the object 
  return false;
};

How can I access the argument '14' in function while calling function like this:

'14'.digit();

FYI: A proper function call would be like function(arg) { console.log(arg); } The keyword this is not the argument but the object you are calling the function from. — getjackx
– getjackx, Commented Feb 20, 2017 at 12:48

Nina Scholz · Accepted Answer · 2017-02-20 12:48:57Z

5

You could use Object#valueOf method

The valueOf() method returns the primitive value of the specified object.

String.prototype.digit = function() {
    console.log(this.valueOf());
    return false;
};

'14'.digit();

The toString() method returns a string representing the object.

String.prototype.digit = function() {
    console.log(this.toString());
    return false;
};

'14'.digit();

answered Feb 20, 2017 at 12:43

Nina Scholz

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