JS: String.prototype.includes

By Xah Lee. Date: . Last updated: .

(new in ECMAScript 2015)

str.includes(searchString)
  • Return true if str contains searchString.
  • Else, return false.
console.log("abcd".includes("cd") === true);
console.log("abcd".includes("x") === false);
str.includes(searchString , position)

Start search at position.

console.log("abcd".includes("cd", 3) === false);