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George Hamilton
2,777 PointsIs this correct? The if let syntax creates the culprit constant and assigns it the return value only if the value != nil
So the "if let" syntax creates the culprit constant and assigns it the return value only if the value != nil; otherwise the culprit constant is not created at all.
1 Answer
Stone Preston
42,016 Pointsyep thats right. this is known as optional binding since you bind the value of the optional to a constant or variable. you can add an else clause to handle the case when the optional is nil if you wanted.
if let someConstant = someOptional {
//optional has a value
println(someConstant)
} else {
//optional is nil
}
you can bind the optional value to a variable as well, although most of the time a constant is fine
if var someVariable = someOptional {
//optional has a value
println(someVariable)
} else {
//optional is nil
}