# Searching in Arrays

# The indexOf() Method

The indexOf() method returns the first index of the item that matches the provided value. If not matches were found the method will return -1.

const colors = ['red', 'orange', 'red', 'purple', 'blue']

console.log(colors.indexOf('purple'))  // 3
console.log(colors.indexOf('red'))     // 0
console.log(colors.indexOf('black'))   // -1

Also see the lastIndexOf() method for returning the last index of the item that matches the provided value.

# The includes() Method

The includes() method determines wether an array includes the specified value, and returns true or false appropriately.

const colors = ['red', 'orange', 'red', 'purple', 'blue']

console.log(colors.includes('purple')) // true
console.log(colors.includes('red'))    // true
console.log(colors.includes('black'))  // false

# The find() Methods

The find() method returns the value of the first item in the array that satisfies the provided testing function. If no item passes the test, undefined is returned.

const numbers = [5, 12, 15, 8]

console.log(numbers.find(item => item > 10)) // 12
console.log(numbers.find(item => item > 20)) // undefined

Also see the findIndex() method, which returns the index of a found element in the array instead of its value.