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 |
Comparison operators are used with conditional statements to decide which action to be taken further.
if(signalcolor == 'Red') { action = 'Stop all vehicles'; }
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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 |
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 |