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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..
repeat() , , .
str.repeat(count)
count0 +: [0, +), .
, , .
RangeError: .RangeError: ."".repeat(-1); // RangeError
"".repeat(0); // ''
"".repeat(1); // ''
"".repeat(2); // ''
"".repeat(3.5); // '' ( )
"".repeat(1 / 0); // RangeError
({ toString: () => "", repeat: String.prototype.repeat }).repeat(2);
// '' ( repeat() )
ECMAScript 2015 JavaScript. , :
if (!String.prototype.repeat) {
String.prototype.repeat = function (count) {
"use strict";
if (this == null) {
throw new TypeError("can't convert " + this + " to object");
}
var str = "" + this;
count = +count;
if (count != count) {
count = 0;
}
if (count < 0) {
throw new RangeError("repeat count must be non-negative");
}
if (count == Infinity) {
throw new RangeError("repeat count must be less than infinity");
}
count = Math.floor(count);
if (str.length == 0 || count == 0) {
return "";
}
// , count 31- ,
// . , (
// 2014 ) , 1 << 28 , :
if (str.length * count >= 1 << 28) {
throw new RangeError(
"repeat count must not overflow maximum string size",
);
}
var rpt = "";
for (var i = 0; i < count; i++) {
rpt += str;
}
return rpt;
};
}
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-string.prototype.repeat |
This page was last modified on 7 . 2023 . by MDN contributors.
StringString.prototype.anchor()at()String.prototype.big()String.prototype.blink()String.prototype.bold()String.prototype.charAt()String.prototype.charCodeAt()String.prototype.codePointAt()String.prototype.concat()String.prototype.endsWith()String.prototype.fixed()String.prototype.fontcolor()String.prototype.fontsize()String.prototype.includes()String.prototype.indexOf()isWellFormed()String.prototype.italics()String.prototype.lastIndexOf()String.prototype.link()String.prototype.localeCompare()String.prototype.match()String.prototype.matchAll()String.prototype.normalize()String.prototype.padEnd()String.prototype.padStart()String.prototype.repeat()String.prototype.replace()String.prototype.replaceAll()String.prototype.search()String.prototype.slice()String.prototype.small()String.prototype.split()String.prototype.startsWith()String.prototype.strike()String.prototype.sub()String.prototype.substr()String.prototype.substring()String.prototype.sup()String.prototype.toLocaleLowerCase()String.prototype.toLocaleUpperCase()String.prototype.toLowerCase()String.prototype.toString()String.prototype.toUpperCase()toWellFormed()String.prototype.trim()String.prototype.trimRight()String.prototype.trimLeft()String.prototype.valueOf()String.prototype[@@iterator]()Object/FunctionObject.prototype.__defineGetter__()Object.prototype.__defineSetter__()Object.prototype.__lookupGetter__()Object.prototype.__lookupSetter__()Object.prototype.hasOwnProperty()Object.prototype.isPrototypeOf()Object.prototype.propertyIsEnumerable()Object.prototype.toLocaleString()Object.prototype.toString()Object.prototype.valueOf()Your blueprint for a better internet.
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