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turn foo.xInPlace(arg) into a foo.x(arg)...
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| func modifiedCopy<Struct, Arg>(var start: Struct, @noescape mutator: (inout Struct) -> Arg -> (), arg: Arg) -> Struct { | |
| mutator(&start)(arg) | |
| return start | |
| } | |
| extension Array { | |
| func arrayByAppending(e: Element) -> Array { | |
| return modifiedCopy(self, mutator: Array.append, arg: e) | |
| } | |
| } |
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