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mmar/TriangularNumbers.swift

Created November 10, 2017 15:51
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Triangular numbers.
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TriangularNumbers.swift
let triangularNumbers = sequence(state: (0,0)) { (state: inout (Int,Int)) -> Int in
state = (state.0 + 1, state.1 + state.0 + 1 )
return state.1
}
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