Operators in javascript with example

Example

Assign values to variables and add them together:

let x = 5;         // assign the value 5 to x
let y = 2;         // assign the value 2 to y
let z = x + y;     // assign the value 7 to z (5 + 2)

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The assignment operator (=) assigns a value to a variable.

The addition operator (+) adds numbers:

The multiplication operator (*) multiplies numbers.

Types of JavaScript Operators

There are different types of JavaScript operators:

• Aritmetic Operators
• Assignment Operators
• Comparison Operators
• Logical Operators
• Conditional Operators
• Type Operators

JavaScript Arithmetic Operators

Arithmetic operators are used to perform arithmetic on numbers:

Arithmetic operators are fully described in the JS Arithmetic chapter.

JavaScript Assignment Operators

Assignment operators assign values to JavaScript variables.

The addition assignment operator (+=) adds a value to a variable.

Assignment operators are fully described in the JS Assignment chapter.

Adding JavaScript Strings

The + operator can also be used to add (concatenate) strings.

Example

let text1 = "John";
let text2 = "Doe";
let text3 = text1 + " " + text2;

The result of text3 will be:

John Doe

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The += assignment operator can also be used to add (concatenate) strings:

Example

let text1 = "What a very ";
text1 += "nice day";

The result of text1 will be:

What a very nice day

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When used on strings, the + operator is called the concatenation operator.

Adding Strings and Numbers

Adding two numbers, will return the sum, but adding a number and a string will return a string:

Example

let x = 5 + 5;
let y = "5" + 5;
let z = "Hello" + 5;

The result of x, y, and z will be:

10
55
Hello5

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If you add a number and a string, the result will be a string!

JavaScript Comparison Operators

Comparison operators are fully described in the JS Comparisons chapter.

JavaScript Logical Operators

Logical operators are fully described in the JS Comparisons chapter.

JavaScript Type Operators

JavaScript Bitwise Operators

Bit operators work on 32 bits numbers.

Any numeric operand in the operation is converted into a 32 bit number. The result is converted back to a JavaScript number.

The examples above uses 4 bits unsigned examples. But JavaScript uses 32-bit signed numbers.
Because of this, in JavaScript, ~ 5 will not return 10. It will return -6.
~00000000000000000000000000000101 will return 11111111111111111111111111111010

Bitwise operators are fully described in the JS Bitwise chapter.

Test Yourself With Exercises

What are the 4 types of JavaScript operators?

What is the or operator in JavaScript?

What are the different types of operator in JavaScript?

What are operators explain with example?