JavaScript DataStructure

Arrays.md

Arrays

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• An array is a data structure that stores a collection of elements, each identified by an index or a key.

• Arrays provide a way to organize and access elements in a sequential manner.

• Array indices in JavaScript start at 0. The first element is accessed using index 0, the second with index 1, and so on.

const arr = ['a', 'b', 'c', 'd'];
console.log(arr[1]); // b

• Unlike some languages where arrays have a fixed size, JavaScript arrays are dynamic and can grow or shrink dynamically. You can add or remove elements at any time.
• JavaScript arrays can store elements of different data types in the same array.

const mixedArray = [1, 'hello', true];

• JavaScript supports multi-dimensional arrays as well. You can create arrays of arrays to represent matrices or tables.

let matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];

• In JavaScript, arrays come with many built-in properties and methods we can use with different purposes, such as adding or deleting items from the array, sorting it, filtering its values, know its, length and so on.
• MDN

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intro.md

What is Data Structure ?

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• A data structure is a way of organizing and storing data to perform operations efficiently. It defines a set of rules or algorithms for organizing and manipulating the data, making it easier to access, insert, delete, or modify information.

• The data structures in javascript are classified into two categories - primitive (built in) and non-primitive (not built in) data structures.

• A primitive data structure can store the value of only one data type.

  • integer, character, boolean, float, String.
  • Primitive data types are usually directly supported by the programming language and are not composed of other data types.

• A non-primitive data structure can store by combining primitive data types or other non-primitive data types.

  • Arrays, linked lists, stacks, queues, trees.
  • They provide more flexibility and allow for the creation of complex data structures.

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