JavaScript Arrays

Implement Arrays In JavaScript

An array specifies a variable that can be indexed as a list in rows and columns

The first index is zero as is common in most programming languages.

An array is a data structure consisting of a collection of elements which are values or variables.

Common Functions For Manipulating Arrays In JavaScript

Common Array Functions

Ojamboshop.com Learning JavaScript Array Functions

Name	Description	Example
Array.length()	Determine how many items	even_numbers.length;
Array.push()	Append items	even_numbers.push(10);
Array.unshift()	Insert item at the beginning	even_numbers.unshift(10);
Array.shift()	Remove item at the beginning	even_numbers.shift();
Array.pop()	Pop the item at the end	even_numbers.pop();
Array.concat()	Merge arrays	even_numbers.concat();
Array.concat()	Merge arrays	even_numbers.concat(even_numbers2);
Array.indexOf()	Returns position of item	even_numbers.indexOf(8);
Array.includes()	Check if item is present	even_numbers.includes(4);
Array.sort()	Sort in alphabetic order	even_numbers.sort();
Array.reverse()	Sort in alphabetic order	even_numbers.reverse();
Name	Description	Example

JavaScript Arrays Snippet

// OjamboShop.com Learning JavaScript Arrays Part I Tutorial //
let even_numbers = [2,4,6,8,10];
console.log(even_numbers);
console.log(even_numbers.length); // Number Of Items In List
console.log(even_numbers[1]); // Access Array Item By Index Number
even_numbers.pop(); // Remove Last Item 
console.log(even_numbers);
even_numbers.push(10); // Add New Item At The End
console.log(even_numbers);
even_numbers.shift();  // Remove First Item
console.log(even_numbers);
even_numbers.unshift(2);  // Add New Item At The Beginning
console.log(even_numbers);
let even_numbers2 = [12, 14, 16];
let combined = even_numbers.concat(even_numbers2); // Merge 2 Arrays
console.log(combined);

Usage

You can use any IDE or text editor and the web browser to compile and execute JavaScript code. For this tutorial, the OjamboShop.com Learning JavaScript Course Web IDE was used to input and compile JavaScript code for the arrays.

Open Source

JavaScript follows the ECMAScript standard and is licensed under the W3C Software License by web browser vendors and runtime environment vendors. This allows commercial use, modification, distribution, and allows making derivatives proprietary.

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Conclusion:

JavaScript makes it easy to use arrays. Use arrays to for a collection of elements which can be values or variables.

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