Variables and Data Types in JavaScript


  In JavaScript, Variables are used to store values. They can be declared using var, let, or const, and the values can be of different types, such as text strings, numbers, booleans, among others.


Syntax:


  Variables in JavaScript can be declared as follows:

  • var : Traditionally used to declare variables, but it has function scope.

  • let: Used to declare block-scoped variables.

  • const: Used to declare variables whose value cannot be changed.

  As for data types, in JavaScript you can work with:

  • Strings: Text

  • Numbers: 100

  • Booleans: true or false

  • Arrays: [1, 2, 3]

  • Objects: { key: "value" }

Purpose:

  • Declare and store data of different types in JavaScript.
  • Allow data reuse and manipulation within a program.
  • Organize and structure information in variables for efficient handling.
  • Facilitate the development of logic in applications through the use of specific types.

Exercises


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Which keyword is used to declare a variable whose value cannot be changed?



JavaScript Concepts and Reference

JavaScript Intro

Control Structures

Functions

Objects in JavaScript

Arrays

DOM (Document Object Model)

Error Handling

Promises and Asynchronicity

Modules in JavaScript

ES6 and Advanced Features

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