JavaScript/Basics: Difference between revisions

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 --[[User:Xora K Joken|Xora K Joken]] 19:18, 3 April 2007 (UTC)
+==Second Lesson==
+This second lesson will introduce the topics of variables and operators.
+===Variables===
+One of the things JavaScript is used for is the manipulation of data. In JavaScript, pieces of data can either be stored in variables or arrays.
+Variables are declared using the ''var'' keyword:
+ var numValue;
+ var textValue;
+ var binaryValue;
+and can be given values when they are created:
+ var numValue = 3;
+ var textValue = "This is text.";
+ var binaryValue = true;
+Multiple variables can even be declared at the same time:
+ var numValue = 3, textValue = "This is text.", binaryValue = true;
+Variables in JavaScript are weakly typed, meaning that the types of individual variables are not determined by the programmer. Unlike many languages, JavaScript only provides a generic ''var'' rather than separate types for integers, floating point numbers, characters, and strings. For example, in the statement
+ var x = 0;
+it is fairly obvious to any individual reading the code that x is a number. However, if the statement
+ x = x + "This is text that is probably not a number";
+were to appear later in the code, JavaScript would change the variable to a text variable. This is one of the reasons that JavaScript is referred to as weakly typed.
+====Arrays====
+===Operators===
 [[Category:JavaScript]]
 [[Category:Basics]]