How to check if float value is actually int

Question

func isFloatInt(floatValue float64) bool{
//What's the implementation here?

}

Test cases:
input: 1.5 output: false;
input: 1 output: true;
input:1.0 output: true;

Answer 1

I just checked on the playground, this does the right thing with NaN as well.

func isIntegral(val float64) bool {
    return val == float64(int(val))
}