The JavaScript Comparison Operators are used to compare two variables, what if we want to compare more than one condition? Very simple, JavaScript Logical Operator will do the trick for you.
The Logical operators in JavaScript Programming language are used to combine two or more conditions and perform the logical operations using && (Logical AND), || (Logical OR) and ! (Logical NOT). The below table describes them
| OPERATORS | NAME | DESCRIPTION | EXAMPLE |
|---|---|---|---|
| && | Logical AND | It will return True when both conditions are true | If (age > 18 && age <=35) |
| || | Logical OR | It will returns True when at-least one of the condition is true | If (age > 35 || age < 60) |
| ! | Logical NOT | If the condition is True, logical NOT operator makes it false | If age = 18 then, !( age = 18) returns false. |
Let us see the truth tables behind the JavaScript Logical Operator for better understanding
&& (JavaScript LOGICAL AND)
| Condition 1 | Condition 2 | Condition 1 && Condition 2 |
|---|---|---|
| True | True | True |
| True | False | False |
| False | True | False |
| False | False | False |
|| (JavaScript LOGICAL OR)
| Condition 1 | Condition 2 | Condition 1 || Condition 2 |
|---|---|---|
| True | True | True |
| True | False | True |
| False | True | True |
| False | False | False |
Please refer to JavaScript Comparison Operators article.