How do I check that a number is float or integer?

Question

How to find that a number is float or integer?

1.25 --> float  
1 --> integer  
0 --> integer  
0.25 --> float
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Answer 1

It really depends on what you want to achieve. If you want to "emulate" strongly typed languages then I suggest you not trying. As others mentioned all numbers have the same representation (the same type).

Using something like Claudiu provided:

isInteger( 1.0 ) -> true

which looks fine for common sense, but in something like C you would get false