Introduction to Built-in Data Structures in JavaScript

JavaScript (JS) is the most popular lightweight, interpreted compiled programming language, and might be your first preference for Client-side as well as Server-side developments.

Let’s see what inbuilt data structures JavaScript offers us:

Data Structure	Internal Implementation	Static or Dynamic
JavaScript Arrays	Contiguous Memory Allocation	Dynamic Nature
JavaScript Strings	Array of Unicode characters	Dynamic Nature
JavaScript Objects	Hashing key-value pair	Dynamic Nature
JavaScript Sets	Hash Tables or Search trees	Dynamic Nature
JavaScript Maps	Hash Tables	Dynamic Nature

JavaScript Arrays:

• An array is a collection of items of the same variable type stored that are stored at contiguous memory locations.
• Each item in an array is indexed starting with 0.

JavaScript Strings: There are two ways to create a string in Javascript:

• By string literal
• By string object

JavaScript Objects: There are different ways to create new objects:

• Create a single object, using an object literal.
• Create a single object, with the keyword new.
• Define an object constructor, and then create objects of the constructed type.
• Create an object using Object.create().

JavaScript Sets:

• A set is a collection of items that are unique i.e no element can be repeated. Set in ES6 are ordered: elements of the set can be iterated in the insertion order.
• Set can store any type of value whether primitive or objects
• it: It is an iterable object whose all elements are added to the new set created, If the parameter is not specified or null is passed then a new set created is empty.

JavaScript Maps:

• Map is a collection of elements where each element is stored as a Key, value pair. Map objects can hold both objects and primitive values as either key or value
• it – It is any iterable object whose values are stored as key, value pair, If the parameter is not specified then a new map created is Empty