String.prototype.repeat()

Baseline

20159

repeat() String

const mood = "Happy! ";

console.log(`I feel ${mood.repeat(3)}`);
// : "I feel Happy! Happy! Happy! "

repeat(count)

count: 0 Infinity

RangeError: count count

repeat()

"abc".repeat(-1); // RangeError
"abc".repeat(0); // ''
"abc".repeat(1); // 'abc'
"abc".repeat(2); // 'abcabc'
"abc".repeat(3.5); // 'abcabcabc' 
"abc".repeat(1 / 0); // RangeError

({ toString: () => "abc", repeat: String.prototype.repeat }).repeat(2);
// 'abcabc' repeat()


ECMAScript 2027 LanguageSpecification # sec-string.prototype.repeat

String.prototype.repeat )(core-js)
es-shims String.prototype.repeat
String.prototype.concat()

MDN

MDN 2025822

GitHub

String
1. String()
1. length
Object/Function
1. __proto__
2. constructor