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Learn JS #5

June 14 • 1:02 pm

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JavaScript Operators

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)

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

Assignment

let x = 10;

The addition operator (+) adds numbers:

Adding

let x = 5;
let y = 2;
let z = x + y;

The multiplication operator (*) multiplies numbers.

Multiplying

let x = 5;
let y = 2;
let z = x * y;

JavaScript Arithmetic Operators

Arithmetic operators are used to perform arithmetic on numbers:

Operator Description
+ Addition
– Subtraction
* Multiplication
** Exponentiation
/ Division
% Modulus (Division Remainder)
++ Increment
— Decrement

JavaScript Assignment Operators

Assignment operators assign values to JavaScript variables.

Operator Example Same As
= x = y x = y
+= x += y x = x + y
-= x -= y x = x – y
*= x *= y x = x * y
/= x /= y x = x / y
%= x %= y x = x % y
**= x **= y x = x ** y

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

Assignment

let x = 10;
x += 5;

JavaScript String Operators

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

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

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

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

JavaScript Comparison Operators

Operator Description
== equal to
=== equal value and equal type
!= not equal
!== not equal value or not equal type
> greater than
< less than
>= greater than or equal to
<= less than or equal to
? ternary operator

JavaScript Logical Operators

Operator Description
&& logical and
|| logical or
! logical not

JavaScript Type Operators

Operator Description
typeof Returns the type of a variable
instanceof Returns true if an object is an instance of an object type

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.

Operator Description Example Same as Result Decimal
& AND 5 & 1 0101 & 0001 0001  1
| OR 5 | 1 0101 | 0001 0101  5
~ NOT ~ 5  ~0101 1010  10
^ XOR 5 ^ 1 0101 ^ 0001 0100  4
<< left shift 5 << 1 0101 << 1 1010  10
>> right shift 5 >> 1 0101 >> 1 0010   2
>>> unsigned right shift 5 >>> 1 0101 >>> 1 0010   2

Note: 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

 

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43 Responses

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