How to check if a string array contains one string in JavaScript?

This question already has an answer here:

How do I check if an array includes an object in JavaScript? 40 answers

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There is an indexOf method that all arrays have (except Internet Explorer 8 and below) that will return the index of an element in the array, or -1 if it's not in the array:

if (yourArray.indexOf("someString") > -1) {
    //In the array!
} else {
    //Not in the array
}

If you need to support old IE browsers, you can polyfill this method using the code in the MDN article.

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You can use the indexOf method and "extend" the Array class with the method contains like this:

Array.prototype.contains = function(element){
    return this.indexOf(element) > -1;
};

with the following results:

["A", "B", "C"].contains("A") equals true

["A", "B", "C"].contains("D") equals false

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var stringArray = ["String1", "String2", "String3"];

return (stringArray.indexOf(searchStr) > -1)

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