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mikeash/eff.swift

Created July 13, 2018 21:03
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eff.swift
func effIt<Target, Result>(_ keypath: KeyPath<Target, Result>) -> (Target) -> Result {
return { $0[keyPath: keypath] }
}
struct Foo {
var x: Int
var y: Int
}
let f = effIt(\Foo.x)
let foo = Foo(x: 42, y: 43)
print(f(foo))
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