JavaScript: String.prototype.includes

By Xah Lee. Date: 2017-02-17. Last updated: 2020-09-12.

New in JS2015.

str.includes( searchString ): Return true if str contains searchString. Else, return false.
str.includes( searchString , position ): Start search at position.

const g = "abcd";

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

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

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