first number
second number
positive difference
var v = pdifff( 5.9, 3.15 );
// returns 2.75
var v = pdifff( 3.14, 4.2 );
// returns 0.0
var v = pdifff( 3.14, NaN );
// returns NaN
var v = pdifff( -0.0, +0.0 );
// returns +0.0
Returns the positive difference between
x
andy
ifx > y
; otherwise, returns0
.