// Modf returns integer and fractional floating-point numbers
// that sum to f. Both values have the same sign as f.
//
// Special cases are:
// Modf(±Inf) = ±Inf, NaN
// Modf(NaN) = NaN, NaN
func Modf(f float64) (int float64, frac float64) {
// approach inspired by GopherJS, see that project for copyright etc
//if f == posInf || f == negInf {
if !hx.CallBool("", "Math.isFinite", 1, f) {
return f, hx.GetFloat("", "Math.NaN")
}
frac = Mod(f, 1)
return f - frac, frac
}
// Pow returns x**y, the base-x exponential of y.
//
// Special cases are (in order):
// Pow(x, ±0) = 1 for any x
// Pow(1, y) = 1 for any y
// Pow(x, 1) = x for any x
// Pow(NaN, y) = NaN
// Pow(x, NaN) = NaN
// Pow(±0, y) = ±Inf for y an odd integer < 0
// Pow(±0, -Inf) = +Inf
// Pow(±0, +Inf) = +0
// Pow(±0, y) = +Inf for finite y < 0 and not an odd integer
// Pow(±0, y) = ±0 for y an odd integer > 0
// Pow(±0, y) = +0 for finite y > 0 and not an odd integer
// Pow(-1, ±Inf) = 1
// Pow(x, +Inf) = +Inf for |x| > 1
// Pow(x, -Inf) = +0 for |x| > 1
// Pow(x, +Inf) = +0 for |x| < 1
// Pow(x, -Inf) = +Inf for |x| < 1
// Pow(+Inf, y) = +Inf for y > 0
// Pow(+Inf, y) = +0 for y < 0
// Pow(-Inf, y) = Pow(-0, -y)
// Pow(x, y) = NaN for finite x < 0 and finite non-integer y
func Pow(x, y float64) float64 {
if runtime.GOARCH == "cs" {
return pow(x, y)
}
// follow GopherJS approach for copyright etc see that project
/*
if x == 1 || (x == -1 && (y == posInf || y == negInf)) {
return 1
}
return math.Call("pow", x, y).Float()
*/
if x == 1 || (x == -1 && !hx.CallBool("", "Math.isFinite", 1, y) && (y < SmallestNonzeroFloat64 || y > MaxFloat64)) {
return 1
}
if x == -1 && IsNaN(y) {
return NaN()
}
return hx.CallFloat("", "Math.pow", 2, x, y)
}