String.prototype.repeat()

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

count

An integer between 0 and Infinity, indicating the number of times to repeat the string.

Return value

A new string containing the specified number of copies of the given string.

Exceptions

RangeError

Thrown if count is negative or if count overflows maximum string length.

Examples

undefined

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

See also