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Question
What are the uses of Logical Operators?
Answer in Brief
Solution
Logical operators perform logical (boolean) operations. Logical operators combine or invert boolean values. Once comparisons are made, the logical operators && (AND), 11 (OR) and ! (NOT) can be used to create more complex conditions.
| Logical Operator | Example | Meaning | Result |
| && | ((4<5) && (10>5)) ((expr1) && (expr2)) | (Logical AND) Returns true if exprl and expr2 both true. | True |
| Il | ((4<5) Il (10>5)) ((expr1) Il (expr2)) | (Logical OR) Returns true if either exprl or expr2 is true, or both are true. | True |
| ! | !(10>5) !(expr1) |
(Logical NOT) Returns true if exprl is false; otherwise, returns false. | False |
Usage:
The rules are as follows:
- For && (AND) the result is false if the first operand is false; otherwise, the result is the Boolean value of the second operand.
- For i | (OR) the result is true if the first operand is true; otherwise, the result is the Boolean value of the second operand.
- For I (NOT) the result is true if the operand is false; otherwise, the result is true.
HTML CODE Using Logical Operators:
<Html>
<Head>
<Title>Demo Program – To test Logical Operators in JavaScript. </Title>
</Head>
<Body>
<script language=”javascript” type=”text/
javascript”>
var valuel = 522, value2=10;
document.write(“<br>Datal ; “+valuel);
document.write(“<br>Data2 ; “+value2);
var res1=((valuel>100) && (vaiuel>601));
var res2=((valuel>100) || (valuel>601));
var res3=(!(valuel!=va!ue2));
document.write(“< br> < br>Whether Data 1 > 100
AND Data 1>601 : “+res1);
document.write(”<brxbr>Whether Datal>600 OR Data 1>601 : “+res2);
document.write(“<br>Whether IDatal != Data2 : “+res3);
</script>
</Body>
</Html>
Output:
shaalaa.com
Javascript Operators and Expressions
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