How to Check if a Javascript Array Includes a Given Value?

javascript

To check if a JavaScript array includes a given value, you can use the includes() method. Here's an example:

const myArray = [1, 2, 3, 4, 5];

// Check if the array includes the value 3
if (myArray.includes(3)) {
  console.log('Value found!');
} else {
  console.log('Value not found.');
}

This will output:

Value found!

If the array does not include the given value, the output would be:

Value not found.

You can also use the indexOf() method to check if an array includes a value, like this:

const myArray = [1, 2, 3, 4, 5];

// Check if the array includes the value 3
if (myArray.indexOf(3) !== -1) {
  console.log('Value found!');
} else {
  console.log('Value not found.');
}

The indexOf() method returns the index of the first occurrence of the given value in the array, or -1 if it is not found. In this example, we check if the index returned by indexOf() is not equal to -1 to determine if the value is in the array.

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