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String.prototype.indexOf returns the position of the string in the other string. If not found, it will return -1.
var haystack = "foo", needle = "oo"; haystack.indexOf(needle) !== -1; //Output: true
Starting from ES6,
includes() determines whether one string may be found within another string, returning true or false as appropriate.
var haystack = "foo", needle = "oo"; haystack.includes(needle); //Output: true
var haystack = "foo", expr = /oo/; // quotes not needed expr.test(haystack); //Output: true
If it comes to a point where speed matters.
indexOf() might be the best choice
Author: Wu Chia Chong
My main areas of interest are software architectures and software design methods, patterns, and new trends in software development.