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Add copyWithin for JavaScript (#17937)

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* Add jscore.copyWithin for seq and array
* Shallow copy mention docs
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Juan Carlos 2021-05-05 02:46:42 -03:00 • committed by GitHub
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changelog.md
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@ -295,6 +295,8 @@
- Added `genasts.genAst` that avoids the problems inherent with `quote do` and can
be used as a replacement.
- Added `copyWithin` [for `seq` and `array` for JavaScript targets](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/copyWithin).
## Language changes

13
lib/js/jscore.nim
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@ -110,3 +110,16 @@ proc parse*(l: JsonLib, s: cstring): JsRoot {.importcpp.}
since (1, 5):
func debugger*() {.importjs: "debugger@".}
## https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/debugger
func copyWithin*[T](self: openArray[T]; target: int): seq[T] {.importjs: "#.copyWithin(#)".}
func copyWithin*[T](self: openArray[T]; target, start: int): seq[T] {.importjs: "#.copyWithin(#, #)".}
func copyWithin*[T](self: openArray[T]; target, start, ends: int): seq[T] {.importjs: "#.copyWithin(#, #, #)".} =
## https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/copyWithin
## `copyWithin` uses shallow copy.
runnableExamples:
assert ['a', 'b', 'c', 'd', 'e'].copyWithin(0, 3, 4) == @['d', 'b', 'c', 'd', 'e']
assert ['a', 'b', 'c', 'd', 'e'].copyWithin(1, 3) == @['a', 'd', 'e', 'd', 'e']
assert [1, 2, 3, 4, 5].copyWithin(-2) == @[1, 2, 3, 1, 2]
assert [1, 2, 3, 4, 5].copyWithin(0, 3) == @[4, 5, 3, 4, 5]
assert [1, 2, 3, 4, 5].copyWithin(0, 3, 4) == @[4, 2, 3, 4, 5]
assert [1, 2, 3, 4, 5].copyWithin(-2, -3, -1) == @[1, 2, 3, 3, 4]