The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
The empty statement is sometimes used with loop statements. See the following example with an empty loop body:
var arr = [1, 2, 3]; // Assign all array values to 0 for (i = 0; i < arr.length; arr[i++] = 0) /* empty statement */ ; console.log(arr) // [0, 0, 0]
Note: It is a good idea to comment the intentional use of the empty statement, as it is not really obvious to distinguish between a normal semicolon. In the following example the usage is probably not intentional:
if (condition); // Caution, this "if" does nothing! killTheUniverse() // So this always gets executed!!!
Another Example: An
if...else statement without curly braces (
true, nothing will happen,
four does not matter, and also the
launchRocket() function in the
else case will not be executed.
if (one) doOne(); else if (two) doTwo(); else if (three) ; // nothing here else if (four) doFour(); else launchRocket();
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