Definitive VoiceXML™

A.4. Flow control

ECMAScript provides many flow control structures for controlling the execution of a program. These are summarized in Table A-4.

Table A-4. Summary of ECMAScript flow control structures

Flow control structure	Description	Example
if...elseif...else	If a given expression evaluates to true, an associated block of code will be executed, otherwise zero or more elseif conditions will be checked, and if none evaluates to true, a final else block of code will be executed (the else part is optional).	if(x < 3){ x += 1; } elseif(x < 1) { x += 2; } else { x = 0; }
for	A loop with a built-in counter initialization, conditional check, and counter advance.	for(x = 0; x < 10; x++){ y = y + x; }
for...in	A loop over each property of an object.