ios
if let
boywin1992
2022. 5. 21. 15:42
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var a : Int? = 100
var b : Int? = nil
if let num = a {
print("num = \(num)")
} else {
print("num is nil")
}
// result : num = 100
if let num = b {
print("num = \(num)")
} else {
print("num is nil")
}
// result : num is nil
if var num = a {
num *= 2
print("num = \(num)")
} else {
print("num is nil")
}
// result : num = 200
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