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Data Types in Javascript 1 Javascript Data Types MCQ 2 Data Types Introduction 3 Numbers 4 Booleans 5 JavaScript Strings 6 var and let in JavaScript

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AJAX and Javascript 1 XHR Request 2 Update the DOM using AJAX 3 JSON Files and AJAX 4 AJAX with JSON 5 XML data using AJAX 6 AJAX and Javascript

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Operators in JavaScript: Types and Usage Explained

Rumman Ansari July 09, 2024 6,737 views

Operators in JavaScript: Types and Usage Explained

Following operators available in JavaScript:

Assignment operators
Arithmetic operators
Comparison operators
Logical operators
String operators
Conditional operators

Assignment Operators

Like most programming languages, = is the assignment operator
Variables can be declared either by key var and value OR simply by assigning values directly. Ex – var x = 42; OR x = 42 ;
Explicit type declaration is not necessary.
Same variable can be assigned values of different data types. To know the type of a variable, use typeof operator. Ex –

var x = "hello"; 
        var x = true;
        console.log(typeof x); //returns Boolean

Comparison Operators

JavaScript has operators like <, >, !=, >=, <= to compare 2 operands.
What is unique about JavaScript is the == and === operators?
== compares the operands and returns true without considering their data type. Ex: var a = 10, b= “10”;
if(a==b) results in true due to the same value they carry, but ignores data types differentiation.
However, if(a===b) results in false as they are of different data types.

Standard Arithmetic Operators

Addition + Ex: [5 + 8]
Subtraction - Ex: [49 – 38]
Division / Ex: [ 49 / 7]
Multiplication * Ex: [28 * 2]

More on Arithmetic Operators

Modulus % to return the remainder of a division – Ex: 50 % 7 is 1
Increment ++ to increment the operand itself by 1 – Ex: If x=4, x++ evaluates to 5
Decrement -- to decrement the operand itself by 1 – Ex: if x= 10, x—- evaluates to 9

Logical Operators

AND &&, OR ||, NOT ! are the logical operators often used during conditional statements to test logic between variables.

Expr1 && Expr2 returns true if both are true, else returns false.
Expr1 || Expr2 returns true if either is true.
!Expr1 operates on single operand to convert true to false and vice versa.

String Operator

Operator + is used to concatenate strings. x = "Hello"; y = " World "; x + y; /* Returns “Hello World” */

While concatenating, JavaScript treats all data types as strings even if values are of different data types.

x = "Hello";
y = 100;
z = 333;
x + y + z;  /*  Returns “Hello100333” */