JS: String.prototype.includes

By Xah Lee. Date: . Last updated: .

New in ES2015.

s.includes ( searchString )

s.includes ( searchString , position )

Return true if s contains searchString, starting search at position. If omitted, it's 0. Else, returns false.

const g = "abcd";

console.log ( g.includes("cd") ); // true
console.log ( g.includes("cd", 3) ); // false

console.log ( g.includes("x") ); // false

Reference

ECMAScript 2015 §Text Processing#sec-string.prototype.includes

JS String

  1. String Overview
  2. Template String
  3. Char, Code Unit, Code Point
  4. String Escape Sequence
  5. Unicode Escape Sequence
  6. String to Number
  7. Encode URL, Escape String
  8. Format Number
  9. Source Code Encoding
  10. Allowed Characters in Identifier
  11. String Object
  12. String.prototype
Liket it? Put $5 at patreon.

Or, Buy JavaScript in Depth

If you have a question, put $5 at patreon and message me.

Web Dev Tutorials

  1. HTML
  2. Visual CSS
  3. JS in Depth
  4. JS Reference
  5. DOM
  6. SVG
  7. Web Dev Blog