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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