JavaScript - logical and: &&

logical and works as follows: just in case it's true if both inputs are true in all other situations the result is false. In next table you can find all possibilities:
abx
FalseFalseFalse
FalseTrueFalse
TrueFalse False
True True True
information about the table: a, b are inputs, x is result

&&

Description

par1 && par2
Used keywords: &&

Input


Output

if the first operand is false, then the second operand is not evaluated.

Examples

JavaScript

in the source code you can find the equivalent of the above table, for easier orientation at the end of each line is a comment which shows the result.
a1 = false && false; // a1 = false
a2 = false && true; // a2 = false
a3 = true && false; // a3 = false
a4 = true && true;  // a4 = true

JavaScript

even one example in what situations we can use the operation logical and:
a && b
a && true
10 >a && a>5

JavaScript

Other pieces of example codes:
b2= x && y
a && b
!b && true

you can find it in the following collections: logical operators
Languages: en hu cz sk