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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 7.
String slice() . .
const str = "The quick brown fox jumps over the lazy dog.";
console.log(str.slice(31));
// Expected output: "the lazy dog."
console.log(str.slice(4, 19));
// Expected output: "quick brown fox"
console.log(str.slice(-4));
// Expected output: "dog."
console.log(str.slice(-9, -5));
// Expected output: "lazy"
slice(indexStart)
slice(indexStart, indexEnd)
.
slice() .
slice() indexEnd . str.slice(4, 8) ( 4, 5, 6, 7 ).
indexStart indexEnd
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| T | h | e | | m | i | r | r | o | r |
m i r r
_______________
Result
indexStart >= str.length, .indexStart < 0, . , max(indexStart + str.length, 0) .indexStart , 0 .indexEnd indexEnd >= str.length slice() .indexEnd < 0 . , max(indexEnd + str.length, 0) .indexEnd indexStart ) indexEnd <= indexStart .slice() slice() .
const str1 = "The morning is upon us."; // str1 23.
const str2 = str1.slice(1, 8);
const str3 = str1.slice(4, -2);
const str4 = str1.slice(12);
const str5 = str1.slice(30);
console.log(str2); // he morn
console.log(str3); // morning is upon u
console.log(str4); // is upon us.
console.log(str5); // ""
slice() slice() .
const str = "The morning is upon us.";
str.slice(-3); // 'us.'
str.slice(-3, -1); // 'us'
str.slice(0, -1); // 'The morning is upon us'
str.slice(4, -1); // 'morning is upon us'
11 16 .
console.log(str.slice(-11, 16)); // "is u"
11 7 .
console.log(str.slice(11, -7)); // " is u"
5 1 .
console.log(str.slice(-5, -1)); // "n us"
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-string.prototype.slice |
This page was last modified on 2025 2 11 by MDN contributors.
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