 | | Issue #321 • September 12, 2019 | | Another useful method that's been added to the variety of array methods in ECMAScript is Array.includes(). This method will return true if a given value is found in the array and false if not.
For example, I'll use the following array: | let myArray = ['one', 2, '3', 'four', 5, NaN]; | Here's how it's used with a single positive argument: | console.log(myArray.includes('one')); // true
console.log(myArray.includes('2')); // false
console.log(myArray.includes(2)); // true
console.log(myArray.includes('3')); // true | Notice the data types are respected and not coerced.
I can also use a second argument, which starts searching for the given value at the specified index in the array: | console.log(myArray.includes('four', 4)); // false
console.log(myArray.includes('four', 3)); // true | The integer value can be negative, which tells the JavaScript engine that I'm searching for the given value starting at array.length+integer: | console.log(myArray.includes('one', -2)); // false
console.log(myArray.includes('four', -4)); // true | Finally, you'll notice the array includes a value of NaN. Since NaN !== NaN in JavaScript, if I use Array.indexOf() to find NaN, the search would fail. But Array.includes() allows me to find NaN in the array: | console.log(myArray.indexOf(NaN)); // -1
console.log(myArray.includes(NaN)); // true | Here's a CodePen that uses all the above code examples.
This feature was added to ECMAScript in ES7 but has strong browser support. It's supported in all modern browsers on desktop and mobile with the only missing browser being IE11.
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