Index | Library Routines | Predefined Types
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Predefined Types
As well as declaring variables with these types, you can also call them just like ordinary functions, in order to test if a value is a certain type.
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| atom
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| test if an object is an atom
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| integer
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| test if an object is an integer
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| sequence
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| test if an object is a sequence
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| string
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| test if an object is a string
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| object
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| test if an object is an object (true except when unassigned)
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| Technicalia
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| In some cases the compiler issues 'probable logic error' warnings, which can be very helpful, for suspicious tests such as integer(i), when it knows the result with absolute certainty, since that suggests that you are either testing the wrong thing or testing it twice. Likewise for the other builtin types atom/string/sequence, however the compiler never issues any warnings about object() tests, and is simply not smart enough to do anything similar with user defined type tests.
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