Javascript: The Definitive Guide

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5.14 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.

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