Overview of jQuery's type testing utility functions.
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Determine the type of an object
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Allow for optional parameters & validation
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$.isArray(array) => returns true if array
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$.isFunction(function) => return true if function
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$.isEmptyObject(object) => return true is simple, empty object
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$.isPlainObject(object) => return true if object was created with {} or 'new' keyword
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$.isXmlDoc(doc) => return true if xml document or node within xml document*
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$.isNumeric(number) => return true if number
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$.isWindow(window) return true if window or frame
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$.type(object) => returns type of object as string
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boolean
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number
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string
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function
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array
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date
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regexp
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object
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undefined
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null
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