Created
March 5, 2019 01:56
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partial count(where:)
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| extension Sequence { | |
| func count(where p: (Element)->Bool)->Int { | |
| return reduce(0) { p($1) ? $0 + 1 : $0 } | |
| } | |
| } | |
| let fn: ((Int) -> Bool) -> Int = [1,2,3].count | |
| let n = fn { $0<2 } | |
| print(n) // 1 | |
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