can anybody please explain how this repeatify function works in javaScript

Asked Dec 04 '17 at 23:49

Active Dec 04 '17 at 23:58

Viewed 34 times

I am new in JScript world and trying to understand this code. But could not understand it. here function only accept a number as parameter, but how he returns the string as he does not receive the string as the parameter. I will geld if somebody please explain this in detail. Besides, I will be glad if somebody also explains what this is doing here?

String.prototype.repeatify = function(numTimes) {
  var strArray = [];
  for (var i = 0; i < numTimes; i++) {
    strArray.push(this);
  }
  return strArray;
};
console.log('hello'.repeatify(5));

I have one more question, what if i save this function in a variable like this :

var someName =  String.prototype.repeatify = function (x) {}

then how could I use this someName function that will do the same.

edited Dec 04 '17 at 23:58

asked Dec 04 '17 at 23:49

Sanjida lina

1

`this` within a prototype function *typically* refers to the instance which in this case is a `String` – Phil Dec 04 '17 at 23:51
Given `hello.repeatify(5)`, it seems you'd be returned an array of `['hello', 'hello', 'hello', 'hello'. 'hello']`. Did you run the code? I'd imagine the last line shows that in the console. – Tyler Roper Dec 04 '17 at 23:52
`someName.call('hello')` – Bergi Dec 04 '17 at 23:54
as far as i know, this refers to the thing from where it is being called and in that case, i guess this refers to the 'hello' string if i am not wrong. – Sanjida lina Dec 04 '17 at 23:54
@Sanjidalina correct. – Olian04 Dec 04 '17 at 23:56

can anybody please explain how this repeatify function works in javaScript

0 Answers0