Definitive VoiceXML™

A.2. Variables

Variables in ECMAScript are declared using the var keyword. Variable names must begin with a letter or an underscore followed by zero or more letters, numbers, and underscores. ECMAScript variables are case-sensitive.

ECMAScript supports weak typing. The programmer does not need to specify the type of a variable when declaring it; the interpreter automatically associates one of the five built-in ECMAScript types with the new variable based on the nature of the value assigned to it. These built-in types are shown in Table A-2.

Table A-2. ECMAScript built-in types

Type	Description	Examples
number	either a floating-point or integer	var e = 2.71828; var i = -1;
Boolean	only true or false	var b = true;
string	a string of characters	var ...