String.prototype.repeat()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.
The repeat()
method of String
values constructs and returns a new string
which contains the specified number of copies of this string, concatenated together.
Try it
const mood = "Happy! ";
console.log(`I feel ${mood.repeat(3)}`);
// Expected output: "I feel Happy! Happy! Happy! "
Syntax
js
repeat(count)
Parameters
Return value
A new string containing the specified number of copies of the given string.
Exceptions
RangeError
-
Thrown if
count
is negative or ifcount
overflows maximum string length.
Examples
Using repeat()
js
"abc".repeat(-1); // RangeError
"abc".repeat(0); // ''
"abc".repeat(1); // 'abc'
"abc".repeat(2); // 'abcabc'
"abc".repeat(3.5); // 'abcabcabc' (count will be converted to integer)
"abc".repeat(1 / 0); // RangeError
({ toString: () => "abc", repeat: String.prototype.repeat }).repeat(2);
// 'abcabc' (repeat() is a generic method)
Specifications
Specification |
---|
ECMAScript® 2025 Language Specification # sec-string.prototype.repeat |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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repeat |
Legend
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- Full support
- Full support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.