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7.4.21 Conditional (trinary) Operator (?:)

Executes one of two statements depending on a condition.
 

Syntax

test ? statement1 : statement2

Arguments

test
Any Boolean expression.
statement1
A statement executed if test is true. May be a compound statement.
statement2
A statement executed if test is false. May be a compound statement.

Remarks

The ?: operator is a shortcut for an if...else statement. It is typically used as part of a larger expression where an if...else statement would be awkward. For example:
 

var now = new Date();

var greeting = "Good" + ((now.getHours() 17) ? " evening." :

" day.");

The example creates a string containing "Good evening." if it is after 6pm. The equivalent code using an if...else statement would look as follows:
 

var now = new Date();

var greeting = "Good";

if (now.getHours() 17)

greeting += " evening.";

else

greeting += " day.";


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