hugo_082 hugo_082 - 2 years ago 148
iOS Question

Guard operation Swift 2

I use Swift 2 and Xcode 7.

I would like to know the difference between

if condition { ... } else { ... }


guard ... else ...

Answer Source

The really big difference is when you are doing an optional binding:

if let x = xOptional {
    if let y = yOptional {
        // ... and now x and y are in scope, _nested_

Contrast this:

guard let x = xOptional else {return}
guard let y = yOptional else {return}
// ... and now x and y are in scope _at top level_

For this reason, I often have a succession of multiple guard statements before I get to the meat of the routine.

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