Javascript Basic – What is an Operator in Javascript

Javascript Operator

We are familiar with mathematical operators and operands. Now we will see how they work in Javascript. The numbers (in an arithmetic operation) are called operands. An operator defines the operation (to be performed between the two operands). In Javascript, there are some kinds of operators. Like as –

1. Arithmetic Operator
2. Comparison Operator
3. Logical/ Relational Operator
4. Assignment Operator
5. Conditional/ Ternary Operator

Arithmetic Operator

Arithmetic operators are used to performing arithmetic on numbers. An arithmetic operator takes numerical values as their operands and returns a single numerical value.

Addition

Between two operands after operation addition ( + ) operator adds those two operands and returns another operand.

10 + 220

Output:

230

We can do the same thing with the assignment operator

Example:

var x = 10;         // assign the value 10 to x
var y = 220;         // assign the value 20 to y
var z = x + y;     // assign the value 30 to z (10 + 20)
console.log(z);

Output:

230

Subtraction

Between two operands after operation subtraction ( – ) operator subtracts the second operand from the first one and returns another operand.

220 - 10

Output:

210

We can do the same thing with the assignment operator

Example:

var x = 220;         // assign the value 20 to x
var y = 10;         // assign the value 10 to y
var z = x - y;     // assign the value 10 to z (20 - 10)
console.log(z);

Output:

210

Multiplication and Division

Between two operands after operation multiplication, the ( *, / ) operator multiplies those two operands and returns another operand. Between two operands after the operation, the division operator divides the first operand by the second one and returns another operand.

Example:

var x = 10;         // assign the value 10 to x
var y = 20;         // assign the value 20 to y
var p = x * y;     // assign the value 200 to z (10 * 20)
var q = y / x;     // assign the value 2 to z (20 / 10)
console.log(p);
console.log(q);

Output:

200
2

Modulus and Exponential

The ( % ) operator is used for finding the remainder in the division operation. Then ( ** ) operator is used for finding the exponential of a number.

Example:

var x = 14;
var y = 5;
var z = x % y;
console.log(z);
 
var x = 14;
var y = x**2;
console.log(y);

Output:

4
196

Increment and Decrement

The Increment ( ++ ) operator adds value 1 with the operand and the decrement ( — ) operator subtracts value 1 from the operand. This is kind of

x = x + 1;

y = y – 1;

Example:

var x = 14;
x++;
console.log(x);
 
var y = 5;
y--;
console.log(z)

Output:

15
4

Comparison Operators

Comparison operators are used to compare two values:

Example:

var x = 14;
var y = 23;
  
   	if x == y ;
   	if x != y;
   	if x >= y;
   	if x <= y;

Output:

>>> false
>>> true
>>> false
>>> true

Logical Operators

Logical operators are used to combining conditional statements:

Example:

var x = 34;
var y = 21;
 
    	x > 42 && y < 23 ;
    	
    	x > 42 || y < 23;
 
    	! (x > 42 && y < 23 ;)

Output:

>>> false
>>> true
>>> true

Assignment Operator

Assignment operators  / Inplace operators are used to assign values to variables:

Example:

var x = 34;
    	x += 29;
   	
    	x -= 29;
    	
    	x *= 29;
    	
    	x %= 29;	

Output:

>>> x == 63
>>> x == 5
>>> x == 986
>>> x == 5

Conditional / Ternary Operator

The ternary operator is a simplified conditional operator like if / else.

Syntax: condition? <expression if true> : <expression if false>

Here is an example:

var x = 10;
var y = 20;
 
var c = a > b ? 100 : 200;

Here assignment of variable c depends on the condition of whether a is greater than b or not. If the condition satisfies, yes then c will assign 100 otherwise 200.

Output:

>>> c = 200;