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Add product proc (#7951)

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* Add product proc

* Update changelog
This commit is contained in:
Koki Fushimi 2018-06-05 07:24:34 +09:00 • committed by Varriount
commit a3e5242d31
2 changed files with 14 additions and 1 deletions
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14
lib/pure/math.nim
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@ -129,6 +129,12 @@ proc sum*[T](x: openArray[T]): T {.noSideEffect.} =
## If `x` is empty, 0 is returned.
for i in items(x): result = result + i
proc prod*[T](x: openArray[T]): T {.noSideEffect.} =
## Computes the product of the elements in ``x``.
## If ``x`` is empty, 1 is returned.
result = 1.T
for i in items(x): result = result * i
{.push noSideEffect.}
when not defined(JS): # C
proc sqrt*(x: float32): float32 {.importc: "sqrtf", header: "<math.h>".}
@ -372,7 +378,7 @@ when not defined(JS): # C
proc `mod`*(x, y: float32): float32 {.importc: "fmodf", header: "<math.h>".}
proc `mod`*(x, y: float64): float64 {.importc: "fmod", header: "<math.h>".}
## Computes the modulo operation for float operators.
## Computes the modulo operation for float operators.
else: # JS
proc hypot*[T: float32|float64](x, y: T): T = return sqrt(x*x + y*y)
proc pow*(x, y: float32): float32 {.importC: "Math.pow", nodecl.}
@ -560,6 +566,12 @@ when isMainModule:
# Function for approximate comparison of floats
proc `==~`(x, y: float): bool = (abs(x-y) < 1e-9)
block: # prod
doAssert prod([1, 2, 3, 4]) == 24
doAssert prod([1.5, 3.4]) == 5.1
let x: seq[float] = @[]
doAssert prod(x) == 1.0
block: # round() tests
# Round to 0 decimal places
doAssert round(54.652) ==~ 55.0