[Edit]

JavaScript - check if array of strings contains given string

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Created by:

Evania

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In this article, we would like to show you how to check if an array of strings contains a given string using JavaScript.

Quick solution:

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var letters = ['a', 'b', 'c'];
​
var letter = 'b'; // string to search for
​
if (letters.indexOf(letter) > -1) {
    // do some action when string is in array e.g:
    console.log('The letter is in the array.');
} else {
    // do some action when string is not in array e.g:
    console.log('The letter is not in the array.');
}

Auto running

Reusable function

Edit

In this example, we create a reusable arrow function to check if string is in the array.

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const isInArray = (array, string) => {
    if (array.indexOf(string) > -1) {
        return true;
    }
   return false;
};
​
​
// Usage example:
​
var letters = ['a', 'b', 'c'];
​
console.log(isInArray(letters, 'a')); // true
console.log(isInArray(letters, 'x')); // false