Undefined Sentence Example

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If it is undefined it will not be equal to a string that contains the characters undefined as the string is not undefined You can check the type of the variable

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undefined undefined

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null undefined

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Null null

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Note undefined is a JavaScript value It means that a variable has been declared but no value has been assigned

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The meaning of undefined with an overview related terms and examples from programming Understand how undefined variables can lead to common error messages

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Description The undefined property indicates that a variable has not been assigned a value or not declared at all

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This disambiguation page lists articles associated with the title Undefined If an internal link incorrectly led you here you may wish to change the link to point directly to the intended article

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The term undefined should be contrasted with the term indeterminate In the first case undefined generally indicates that a value or property can have no meaningful definition