Summary of JavaScript Statements

This chapter has introduced each of the statements of the JavaScript language. Table 5.1 summarizes these statements, their syntax, and their purpose.

Table 5-1: JavaScript Statement Syntax
Statement	Syntax	Purpose
break	break;	Exit from the innermost loop.
continue	continue;	Jump to top of containing loop.
empty	;	Do nothing.
for	for (`initialize` ; `test` ; `increment`) `statement`	Easy-to-use loop.
for/in	for (`variable` in `object`) `statement`	Loop through properties of object.
function	function `funcname`([`arg1` [..., `argn`]]) { `statements` }	Declare a function.
if/else	if (`expression`) `statement1` [ else `statement2` ]	Conditionally execute code.
return	return `expression`;	Return a value from a function.
var	var `name_1` [ = `value_1` ] [ ..., `name_n` [ = `value_n`]] ;	Declare and initialize variables.
while	while (`expression`) `statement`	Basic loop construct.
with	with (`object`) `statement`	Specify the current name space.