| Ensure that x is array, and raise AssertError if it is not.
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| Ensure that x is boolean, and raise AssertError if it is not.
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| Ensure that x is function, and raise AssertError if it is not.
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| Ensure that x follows the type of ref , and raise AssertError if it is not.
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| Ensure that x is null, and raise AssertError if it is not.
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| Ensure that x is null or undefined, and raise AssertError if it is not.
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| Ensure that x is number, and raise AssertError if it is not.
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| Ensure that x is object, and raise AssertError if it is not.
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| Ensure that x is string, and raise AssertError if it is not.
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| Ensure that x is undefined, and raise AssertError if it is not.
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