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
countis negative or ifcountoverflows 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® 2026 Language Specification # sec-string.prototype.repeat |