How to check for inf? Swift xcode7

Question

How do I check in Swift if the result of a calculation is not infinite?

My code below is crashing after printing that"dividepointsbyrest is inf". "if dividepointsbyrest != nil" checks for nil. 'if dividepointsbyrest != inf' does not work.

var dividepointsbyrest = (BPMpoints / restDouble)
    print("dividepointsbyrest is") 
    print(dividepointsbyrest) 

    var BPMpercentD = 100.0 * dividepointsbyrest

Answer 1

Double has an isInfinite/isFinite properties for that.

if dividepointsbyrest.isInfinite {
    print("dividepointsbyrest is infinite")
}

or

if dividepointsbyrest.isFinite {
    print("dividepointsbyrest is finite")
}