Manipulating a String's content with an Integer

Question

I'f you're familiar with Python, I'm sure you're aware that you can multiply a String by an Integer to get that desired amount of Strings back.

Example:

'J' * 3 --> 'JJJ'

What's the most efficient way to do this in JavaScript?

I was looking for an inline method; similar to that of Pythons behaviour

A few of my ideas:

var str = 'J',
    strOld = str,
    timesToExtend = 3;

for(var i = 0; i < timesToExtend; i++){
    str += strOld;
}

= 'JJJ'

var str = 'J',
    timesToExtend = 5,
    strOld = str;

while(!timesToExtend){
  str += strOld;
  timesToExtend--;
}

These are just rough ideas, so don't expect them to be 100% accurate and working. I assume this MUST contain a loop; however any method without a loop will be praised!

Thanks for reading; thank you for your response in advance!

http://stackoverflow.com/questions/14343844/create-a-string-of-variable-length-filled-with-a-repeated-character — ryan, Aug 12 '16 at 22:47

score 0 · Accepted Answer · answered Aug 12 '16 at 22:43

0

In ES6 you can use Array.prototype.fill() and then join the array:

Array(3).fill('J').join('');

answered Aug 12 '16 at 22:43

madox2

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Will this work in Node.JS? – Aug 12 '16 at 22:45
@Robinlemon it works from node 4.4.5 – madox2 Aug 12 '16 at 22:47

Manipulating a String's content with an Integer

1 Answers1