Conditional (triple-mesh) operator (?:)

condition | operation

Executes one of two statements according to a condition.

test ? Statement 1 : statement2

Parameters

Test

Any Boolean expression.

Statement 1

The statement to execute when test is true . Can be a compound statement .

Statement 2

The statement to execute when test is false . Can be a compound statement.

Description

?: operator is a shortcut to a if...else statement. It is often used as part of a larger expression, and it is not consistent to use the if...else statement here. For example:

?: " day.");

In this example, if it is 6pm, a string containing the "good evening." is created. The equivalent code for using the if...else statement is as follows:

var now = new Date();var greeting = "Good";if (now.getHours() > 17)greeting += " evening.";else   greeting += " day.";

Requirements

Version 1

Please see

If...else Statement | Operator Precedence | Operator Summary