ARRAYS IN JAVASCRIPT

What is an Array?

Arrays are objects or special type of variables that can store multiple values at once. The multiple items are stored under a single variable name.

Creating Arrays.

There are two ways of creating arrays;

Using array literal [ ]

For example;

const fruits= [ "banana", "apple", "orange" ];

Using the new keyword.

For example;

const fruits= new Array( "banana", "apple", "orange");

Accessing elements of an array.

You can access elements of an array using indices (0, 1, 2 …). For example;

const fruits= [ "banana", "apple", "orange" ];
console.log(fruits);        // "banana", "apple", "orange"
console.log( fruits[0] );   // "banana"
console.log( fruits[1] );   // "apple"

Note: Array indexing starts from 0, not 1

Array Methods.

Array methods make it easier to perform useful operations with arrays. Some of the commonly used JavaScript array methods are:

push()

The push() method adds an element at the end of the array. For example,

const fruits= [ "banana", "apple", "orange" ];
fruits.push( "mango" );
console.log( fruits ); // [ "banana", "apple", "orange", "mango" ]

pop()

The pop() method removes the last element from an array. For example;

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

unshift()

The unshift() method adds an element at the beginning of the array. For example;

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

shift()

The shift() method removes the first element from an array. For Example;

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

Array Length

We can find the length of an element (the number of elements in an array) using the length property. For example;

const fruits= [ "banana", "apple", "orange" ];
console.log( fruits.length ); // 3

concat()

Joins two or more arrays and returns a result. For example;

const fruits = [ "banana", "apple", "orange"];

const colors = [ "red", "white", "green"];

const comb = fruits.concat( colors);
console.log(comb); // [ 'banana', 'apple', 'orange', 'red', 'white', 'green' ]

slice()

Selects the part of an array and returns the new array. For example;

const colors = [ "red", "white", "green"];
console.log( colors.slice(1)); //[ 'white', 'green' ]

Checkout more here on JavaScript array methods.

Happy Learning!!

Arrays In Javascript

What is an Array?

Creating Arrays.

Accessing elements of an array.

Array Methods.