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JavaScript - String slice() method example

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Created by:
Ela-Davey
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The slice() method is used to extract a part of a string in JavaScript.

// ONLINE-RUNNER:browser;

var text = 'abcde';

console.log(text.slice(1)); // bcde
console.log(text.slice(2)); // cde

console.log(text.slice(1, 3));  // bc
console.log(text.slice(2, 4));  // cd

console.log(text.slice(-2));    // de
console.log(text.slice(2, -1)); // cd

1. Documentation

Syntax

slice(startIndex)

slice(startIndex, endIndex)

Parameters

startIndex - the index at which to begin extraction. If negative, the string is sliced from string.length + startIndex to the end of the string.

endIndex - the index of the first character to exclude from the returned substring.

ResultA new string containing the sliced part of the string.
Description

The slice() extracts some text from one string and returns it as a new string.

The method extracts up to endIndex (but not including).

2. Practical examples

Positive indexing

// ONLINE-RUNNER:browser;

var text = 'abcde';

console.log(text.slice());  // abcde
console.log(text.slice(1)); // bcde
console.log(text.slice(2)); // cde

console.log(text.slice(1, 3));  // bc
console.log(text.slice(1, 4));  // bcd

console.log(text.slice(2, 3));  // c
console.log(text.slice(2, 4));  // cd

Negative indexing

// ONLINE-RUNNER:browser;

var text = 'abcde';

console.log(text.slice(-1)); // e
console.log(text.slice(-2)); // de

console.log(text.slice(-3, -2));  // c
console.log(text.slice(-3, -1));  // cd

console.log(text.slice(-4, -2));  // bc
console.log(text.slice(-4, -1));  // bcd

Mixed

// ONLINE-RUNNER:browser;

var text = 'abcde';

console.log(text.slice(1, -2));  // bc
console.log(text.slice(1, -3));  // b

console.log(text.slice(2, -2));  // c
console.log(text.slice(2, -3));  // ''

References

  1. String.prototype.slice() - JavaScript | MDN

Alternative titles

  1. JavaScript - String.prototype.slice() documentation with examples
  2. js - String slice() method documentation with examples
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JavaScript - String (documentation)

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