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jpmcglone/Additions.swift

Created October 4, 2016 16:56
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Swift 3 - Set if not nil
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Additions.swift
import Foundation
func setIfNotNil<T>(_ obj: inout T?, _ other: T?) {
guard other != nil else { return }
obj = other
}
@seivan
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seivan commented Oct 4, 2016 

var sample:Int? = 3
var sampleEmpty:Int? = nil
var sampleNotEmpty:Int? = 100

func setIfNotNil<T>(_ obj: inout T?, _ other: T?) {
    guard other != nil else { return }
    obj = other
}

func testCaseOne(lhs:Int?, rhs:Int?) {
    var l = lhs
    setIfNotNil(&l, rhs)

}


func testCaseTwo(lhs:Int?, rhs:Int?) {
    var l = lhs
    l = rhs ?? l
}


testCaseOne(lhs: sample, rhs: sampleEmpty)

testCaseTwo(lhs: sample, rhs: sampleEmpty)

I prefer the other one, being idiomatic. But I rather not mutate.

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