JavaScript Array Functions (#shorts)

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JavaScript Array Functions

JavaScript provides many useful built-in functions for working with arrays. Here are some examples of commonly used array functions:

push(): adds one or more elements to the end of an array.

let fruits = ['apple', 'banana'];
fruits.push('orange', 'pear');
console.log(fruits); // ["apple", "banana", "orange", "pear"]

pop(): removes the last element from an array and returns it.

let fruits = ['apple', 'banana', 'orange'];
let lastFruit = fruits.pop();
console.log(lastFruit); // "orange"
console.log(fruits); // ["apple", "banana"]

shift(): removes the first element from an array and returns it.

let fruits = ['apple', 'banana', 'orange'];
let firstFruit = fruits.shift();
console.log(firstFruit); // "apple"
console.log(fruits); // ["banana", "orange"]

unshift(): adds one or more elements to the beginning of an array.

let fruits = ['apple', 'banana'];
fruits.unshift('orange', 'pear');
console.log(fruits); // ["orange", "pear", "apple", "banana"]

slice(): returns a new array containing a portion of the original array.

let fruits = ['apple', 'banana', 'orange', 'pear'];
let citrus = fruits.slice(2);
console.log(citrus); // ["orange", "pear"]

splice(): changes the contents of an array by removing or replacing existing elements and/or adding new elements.

let fruits = ['apple', 'banana', 'orange', 'pear'];
fruits.splice(1, 2, 'grape', 'melon');
console.log(fruits); // ["apple", "grape", "melon", "pear"]

concat(): merges two or more arrays and returns a new array.

let fruits = ['apple', 'banana'];
let moreFruits = ['orange', 'pear'];
let allFruits = fruits.concat(moreFruits);
console.log(allFruits); // ["apple", "banana", "orange", "pear"]

indexOf(): returns the index of the first occurrence of a specified value in an array, or -1 if it is not found.

let fruits = ['apple', 'banana', 'orange'];
let orangeIndex = fruits.indexOf('orange');
console.log(orangeIndex); // 2

filter(): returns a new array containing all elements that pass a specified test.

let numbers = [1, 2, 3, 4, 5];
let evenNumbers = numbers.filter(function(number) {
return number % 2 === 0;
});
console.log(evenNumbers); // [2, 4]

map(): returns a new array containing the results of calling a function on each element in the original array.

let numbers = [1, 2, 3, 4, 5];
let squaredNumbers = numbers.map(function(number) {
return number * number;
});
console.log(squaredNumbers); // [1, 4, 9, 16, 25]

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