Repeat String - Javascript

Question

What is the best or most concise method for returning a string repeated an arbitrary amount of times?

The following is my best shot so far:

function          


        

Answer 1

People overcomplicate this to a ridiculous extent or waste performance. Arrays? Recursion? You've got to be kidding me.

function repeat (string, times) {
  var result = ''
  while (times-- > 0) result += string
  return result
}

Edit. I ran some simple tests to compare with the bitwise version posted by artistoex / disfated and a bunch of other people. The latter was only marginally faster, but orders of magnitude more memory-efficient. For 1000000 repeats of the word 'blah', the Node process went up to 46 megabytes with the simple concatenation algorithm (above), but only 5.5 megabytes with the logarithmic algorithm. The latter is definitely the way to go. Reposting it for the sake of clarity:

function repeat (string, times) {
  var result = ''
  while (times > 0) {
    if (times & 1) result += string
    times >>= 1
    string += string
  }
  return result
}