JavaScript - Check if array includes value with includes()

A JavaScript code example for checking if an array includes a specified value using includes().

The HTML has an output element with id "output" to display the check result.

<p id="output"></p>

The includes() method can be used to check if an array includes a specified value.

The value to check is passed as the first argument to includes().
It returns "true" if the value exists, "false" otherwise.

An optional second start position argument can also be passed to includes().

let array = ['Apple', 'Banana', 'Grape'];

// Check if array includes value
if(array.includes('Apple')) {
	document.querySelector('#output').innerHTML = 'Value exists';
} else {
	document.querySelector('#output').innerHTML = 'Value does not exist';
}