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<All about types in Javascript - Type detection ⁄ >




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The drawback of having a loosely typed language like Javascript, is that you sometimes have to determine the current type of a variable. This mostly occurs when you create a function that accepts different types of parameters - or is limited to one type.

A while ago, I had a function to open up a dialog to allow the user to send an email. That function accepted a parameter recipient to prefill the to-field. For convenience, I accepted a string and an array as that parameter. If an array was given, I had to convert it to a string. So I needed to check, if I really had been given an array.

Unfortunately, detecting an array is the most complex task of type detection. So I will postpone my solution until later and start with the easier ones.
Basic type detection



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