JavaScript Comparisons

JavaScript Comparison Operators

JavaScript comparison operators are used in logical statements to compare two variables or values and decide further actions on result.

Below comparisons are based on taking variable age=18

Operator	Description	Comparing	Returns	Try it
==	Equal to	age == 18	true	Run the code
		age == 19	false	Run the code
		age == “18”	true	Run the code

===	Equal to value and data type	age === 18	true	Run the code
		age === 19	false	Run the code
		age === “18”	false	Run the code
!=	Not equal to	age != 18	false	Run the code
!==	Not equal to value and data type	age !== 18	false	Run the code
		age !== “18”	true	Run the code
		age !== “19”	true	Run the code
>	greater than	age > 20	false	Run the code
<	less than	age < 20	true	Run the code
>=	greater than or equal to	age >= 18	true	Run the code
<=	less than or equal to	age <= 20	true	Run the code

Use of comparison operators

Comparison operators are used with conditional statements to decide which action to be taken further.

if(signalcolor == 'Red') {
    action = 'Stop all vehicles';
}

>Download the code Run the code

JavaScript Logical Operators

Logical operators are used for logic between variables or values.

It is also used to combine more than one conditions with comparison operator

Consider startTime = 9 and endTime = 18 for below logical expressions.

Operator	Description	example
&&	and	currentTime > startTime && currentTime < endTime evaluates to true if currentTime = 12	Run the code
\|\|	or	currentTime < startTime \|\| currentTime >= endTime evaluates to true if currentTime = 8	Run the code
!	not	!(startTime == 9) evaluates to false	Run the code

JavaScript Bitwise Operators

Bitwise operators work on 32-bits numbers only. So JavaScript number is converted to 32-bit number before being used by bitwise operator. The result is converted back to JavaScript number after completion.

Operator	Description	Example	Same as	Result	Output
&	AND	x = 5 & 1	x = 0101 & 0001	0001	1
\|	OR	x = 5 & 1	x = 0101 \| 0001	0101	5
~	NOT	x = 5 & 1	x = 0101 ~ 0001	1010	10
^	XOR	x = 5 & 1	x = 0101 ^ 0001	0100	4
<<	Left shift	x = 5 << 1	x = 0101 << 0001	1010	10
>>	Right shift	x = 5 >> 1	x = 0101 >> 0001	0010	2

<<< JavaScript BooleanJavaScript Conditions >>>