Difference between revisions of "JavaScript Variable Types"
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<td>function<td>any user defined function<td>A function is one of the basic building blocks of most programming languages including JavaScript. Functions are used to break up a script into clean, reusable modules. Functions are covered in a later chapter.</td> | <td>function<td>any user defined function<td>A function is one of the basic building blocks of most programming languages including JavaScript. Functions are used to break up a script into clean, reusable modules. Functions are covered in a later chapter.</td> | ||
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| + | <td>object<td>document, window<td>JavaScript provides a set of predefined objects to which the JavaScript programmer has access. For example the ''document'' object refers to the current web page and can be accessed to make changes to the page content. | ||
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Revision as of 20:02, 11 April 2007
JavaScript supports five different types of variable. These variable types are outlined in the following table together with a brief description of each type:
| Type | Example | Description |
|---|---|---|
| boolean | true, false | The boolean variable is used to record a value of either true or false. Internally this is essentially stored as 1 for true and 0 for false. |
| number | 1, -31, 0.023 | The number variable holds any type of number, either an integer or a real number. |
| string | "Hello World!" | The string variable type stores a string of characters, typically making up either a word or sentence. string variables can also be assigned empty strings. |
| function | any user defined function | A function is one of the basic building blocks of most programming languages including JavaScript. Functions are used to break up a script into clean, reusable modules. Functions are covered in a later chapter. |
| object | document, window | JavaScript provides a set of predefined objects to which the JavaScript programmer has access. For example the document object refers to the current web page and can be accessed to make changes to the page content. |
