String.prototype.repeat()
Baseline
Widely available
This feature is well established and works across many devices and browser versions. Itās been available across browsers since āØSeptember 2015ā©.
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 |
|---|
| ECMAScriptĀ® 2026 LanguageĀ Specification # sec-string.prototype.repeat |