Language Reference |
Executes one of two expressions depending on a condition.
test ? expression1 : expression2
The ?: operator syntax has these parts:
Part Description test Any Boolean expression. expression1 An expression executed if test is true. expression2 An expression executed if test is false.
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: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" + ((now.getHours() > 17) ? " evening." : " day.");var now = new Date(); var greeting = "Good"; if (now.getHours() > 17) greeting += " evening."; else greeting += " day.";