In JavaScript, how would I create a string of repeating strings x number of times:
var s = new String(" ",3);
//s would now be " "
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5 Answers
There is no such function, but hey, you can create it:
String.prototype.repeat = function(times) {
return (new Array(times + 1)).join(this);
};
Usage:
var s = " ".repeat(3);
Of course you could write this as part of a standalone group of functions:
var StringUtilities = {
repeat: function(str, times) {
return (new Array(times + 1)).join(str);
}
//other related string functions...
};
Usage:
var s = StringUtilities.repeat(" ", 3);
6 Comments
Loïc Faure-Lacroix
I prefer that solution to mine. I didn't know we could append functionality to String class and possibly to any class.
Ivo Wetzel
Ahhh, go away with prototype extension...
Michael Lorton
@Sybiam -- you can, but don't. Well, if it's something universally useful, OK, but something like this, put it in a library.
Jacob Relkin
@Malvolio I updated my answer to accomodate your point of view as well...
fil maj
@Ivo I personally love prototype extension; why not make use of a language construct that is available to you?
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You can also use Array.join:
function repeat(str, times) {
return new Array(times + 1).join(str);
}
> repeat(' ', 3)
" "
Comments
Here's a neat way that involves no loops. In addition to being concise, I'm pretty sure using join is much more efficient for very large strings.
function repeat(str, num) {
return (new Array(num+1)).join(str);
}
You could also put this code on the String prototype, but I'm of the mindset that it's a bad idea to mess with the prototype of built in types.
Comments
I think your best and only way to achieve this is to loop over your string.. As far as I know, there is no such feature in any languages.
function multiString(text, count){
var ret = "";
for(var i = 0; i < count; i++){
ret += text;
}
return ret;
}
var myString = multiString(" ", 3);
But I guess you could figure it out.
answered Dec 28, 2010 at 22:08
Loïc Faure-Lacroix
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2 Comments
Good Person
Perl has the X operator to repeat things like this - there are other languages as well
Loïc Faure-Lacroix
I know in python and from a solution bellow we can do it with arrays and join. But I don't consider these solutions as features. I don't know about the X operator but nowadays I'm not surprised about Perl. After I saw the Periodic table of operators for perl. Nothing will surprise me anymore.
Haven't you tried with a loop
for (var i = 0; i < 3; i++) {
s += " "; }
?
