How to remove an element of a given custom type value from an array in Swift

Question

I want to remove element of custom type value from an array.

I want to pass a variant instance to function to remove it from array, I don't want to use removeAtIndex().

var favoriteVariants: [Variant]

func removeVariant(variant: Variant)
{
}

Answer 1

If Variant is Equatable and you only want to remove the first one that matches:

if let idx = favoriteVariants.indexOf(variant) {
    favoriteVariants.removeAtIndex(idx)
}

If it isn’t Equatable and you have some other matching criteria to find just one to remove:

let idx = favoriteVariants.indexOf {
   // match $0 to variant
}

if let idx = idx {
    favoriteVariants.removeAtIndex(idx)
}

(these are assuming Swift 2.0 – if 1.2, it’s find(favoriteVariants, variant) instead of indexOf, and there isn’t a version that takes a closure, though it’s not too hard to write one)

If there are multiple ones you want to remove in one go:

favoriteVariants = favoriteVariants.filter {
    // criteria to _keep_ any given favorite
}

All of these could be wrapped in extensions if what you want to do is general enough to justify it.