Learn ECMAScript - Second Edition

The includes(string, index) method

The includes() method is used to find whether one string may be found in another string, returning true or false as appropriate. Here is an example to demonstrate this:

const str = "Hi, I am a JS Developer";console.log(str.includes("JS")); //Output "true"

It takes an optional second parameter representing the position in the string at which to begin searching. Here is an example to demonstrate this:

const str = "Hi, I am a JS Developer";console.log(str.includes("JS", 13)); // Output "false"