String includes()The includes() method of strings returns whether a search string appears within the string.stringStringswidely2015-09-302018-03-30https://tc39.es/ecma262/multipage/text-processing.html#sec-string-objectses6-string-includeshttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/includesjavascript.builtins.String.includeshttps://nowyoucanuse.com/features--string-includes.html