A Paragraph
``` * **js in body** ```javascriptA Paragraph
``` ## External js: * create a file with js extension and link the html file. like:- ```javascript ``` ## Variables:- * Variable is ued to store the data, such as container * Variable a name of storage location. * variable are three types. 1. `let` **syntax**: # Data Types 1. A JavaScript variable can hold any type of data. 2. JavaScript provides different **data types** to hold different types of values. There are two types of data types in JavaScript. 1. Primitive data type 2. Non-primitive data type ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1672141427646/6d280a9e-481b-41d0-8812-f0cd446be2d9.jpeg align="center") ```javascript // Numbers: let length = 16; let weight = 7.5; // Strings: let color = "Yellow"; let lastName = "Johnson"; // Booleans let x = true; let y = false; // Object: const person = {firstName:"John", lastName:"Doe"}; // Array object: const cars = ["Saab", "Volvo", "BMW"]; ``` # Operators * JavaScript operators are symbols that are used to perform operations on operands. For example: * `var sum=10+20;` Here, + is the arithmetic operator and = is the assignment operator. * ***here are following types of operators in JavaScript.*** **Arithmetic Operators**:- ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1672142015958/c8fc62e6-f083-402b-b80f-46d2b6c14161.jpeg align="center") **Comparison Operators**:- ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1672142134982/e42c663d-1877-4bbc-914d-4b359df39aca.png align="center") **Bitwise Operators**:- ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1672142249991/ca43f356-040e-48e3-8ab1-93f8ac407f0b.png align="center") **Logical Operators**:- ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1672142321274/81f10f90-3e12-4f3e-abd0-28b5a262bcc8.png align="center") **Assignment Operators**:- ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1672142381323/9940e1d7-8634-429c-8c5b-e452ba8219f8.jpeg align="center") # JavaScript If-else 1. If Statement 2. If else statement 3. if else if statement ### If statement:- ![](https://cdn.hashnode.com/res/hashnode/image/upload/v1672150224846/2c6130e4-eba1-4cae-b1fa-38f8182e40ed.png align="center") ```javascript ``` ### If...else Statement:- ```javascript ``` ### If...else if statement:- ```javascript ``` # JavaScript Switch The **JavaScript switch statement** is used *to execute one code from multiple expressions*. It is just like else if statement. ```javascript ``` # JavaScript Loops * The **JavaScript loops** are used *to iterate the piece of code* using for, while, do while or for-in loops.It makes the code compact. It is mostly used in array. 1. for loop 2. while loop 3. do-while loop ## For loop:- The **JavaScript for loop** *iterates the elements for the fixed number of times*. It should be used if number of iteration is known. ```javascript ``` ## while loop:- The **JavaScript while loop** *iterates the elements for the infinite number of times*. It should be used if number of iteration is not known. ```javascript ``` ## do while loop:- The **JavaScript do while loop** *iterates the elements for the infinite number of times* like while loop. But, code is *executed at least* once whether condition is true or false. ```javascript ```