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Pretz/get.swift

Created September 24, 2015 18:21
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  1. Pretz created this gist Sep 24, 2015.
    15 changes: 15 additions & 0 deletions get.swift
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,15 @@
    import Swift

    extension CollectionType where Index: SignedNumberType, Index == Index.Distance {
    func get(var position: Self.Index) -> Self.Generator.Element? {
    if position < 0 {
    position = self.endIndex.advancedBy(position)
    }
    return (indices ~= position) ? self[position] : nil

    }
    }

    let a = [1, 2, 3, 4, 5]

    a.get(-2) // returns 4