JavaScript - Logical or: ||

Logical OR works as follows: just in case it's the result false if both inputs are false, in all other cases the result is true. In next table you can find all possibilities:

a	b	x
False	False	False
False	True	True
True	False	True
True	True	True

information about the table: a, b are inputs, x is result

||

Description

par1 || par2

Used keywords: ||

Input

par1 - Logical value
par2 - Logical value

Output

Result - Logical value

If the first operand is true, 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 = true
a3 = true  || false; // a3 = true
a4 = true  || true;  // a4 = true

JavaScript

Even one example in what situations we can use the operation logical or:

(b || c) || a
a || true
a>1 || a<100

JavaScript

Other pieces of example codes:

j > 128 || false

a || true

(10 >a || a<5)

You can find it in the following collections: logical operators

Logical or in another programming language:

Differences to: