1.122.13 Number: testing

closeTo: num

Answer whether the receiver can be considered sufficiently close to num (this is done by checking equality if num is not a number, and by checking with 0.01% tolerance if num is a number).

even

Returns true if self is divisible by 2

isExact

Answer whether the receiver performs exact arithmetic. Most numeric classes do (in fact the only exceptions is Float and its descendants), so the default is to answer true rather than calling #subclassResponsibility.

isFinite

Answer whether the receiver represents a finite quantity. Most numeric classes are for finite quantities, so the default is to answer true rather than calling #subclassResponsibility.

isInfinite

Answer whether the receiver represents an infinite quantity. Most numeric classes are for finite quantities, so the default is to answer false rather than calling #subclassResponsibility.

isNaN

Answer whether the receiver is a Not-A-Number. Most numeric classes don’t handle nans, so the default is to answer false rather than calling #subclassResponsibility.

isNumber

Answer ‘true’.

isRational

Answer whether the receiver is rational - false by default

negative

Answer whether the receiver is < 0

odd

Returns true if self is not divisible by 2

positive

Answer whether the receiver is >= 0

sign

Returns the sign of the receiver.

strictlyPositive

Answer whether the receiver is > 0