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Comparison operators are used in logical statements to determine equality or difference between variables or values and return either true or false.
Comparison operators can be used in conditional statements to compare values and take action depending on the result:
Let say x = 5
Operator | Description | Example | Result |
---|---|---|---|
== | equal to | x == 8 | false |
== | equal to | x == 5 | true |
== | equal to | x == "5" | true |
=== | equal value and equal type | x === 5 | true |
=== | equal value and equal type | x === "5" | false |
!= | not equal | x != 8 | true |
!== | not equal value or not equal type | x !== 5 | false |
!== | not equal value or not equal type | x !== "5" | true |
> | greater than | x > 8 | false |
< | greater than | x < 8 | true |
>= | greater than | x >= 8 | false |
<= | greater than | x <= 8 | true |
if (age < 18) {
text = "Too young to vote";
}
Let say x = 6 and y = 3
Operator | Description | Example | Result |
---|---|---|---|
&& | AND | (x < 10 && y > 1) | true |
|| | OR | (x == 5 || y == 5) | false |
! | NOT | !(x == y) | true |
JavaScript also contains a conditional (ternary) operator that assigns a value to a variable based on some condition.
Syntax
variablename = (condition) ? value1:value2
Example
let voteable = (age < 18) ? "Too young" : "Old enough";
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