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Start with an array of optionals and flat whack the heck out of 'em. | |
flatMap | |
let results = arrayOfOptionals.flatMap({$0}) | |
for case | |
var results = [String]() | |
for case let value? in arrayOfOptionals {results.append(value)} | |
flatMap with (ugly) forced unwrap | |
let results = arrayOfOptionals.flatMap{$0 == nil ? [] : [$0!]} | |
map and append | |
var results = [String]() | |
arrayOfOptionals.map({ | |
(optional : String?) -> Void in | |
if case let value? = optional { | |
results.append(value)} | |
}) | |
for / guard | |
results = [String]() | |
for optional in arrayOfOptionals { | |
guard let unwrapped = optional else {continue} | |
results.append(unwrapped) | |
} | |
or worse: | |
results = [String]() | |
for optional in arrayOfOptionals { | |
do { | |
guard let value = optional else {throw NSError(domain:"", code:0, userInfo:nil)} | |
results += [value] | |
} catch {} | |
} | |
flatmap / map | |
// Thanks eridius | |
results = arrayOfOptionals.flatMap({ $0.map({[$0]}) ?? [] }) | |
reduce / combine | |
// Thanks eridius | |
results = arrayOfOptionals.reduce([], combine: { $1 == nil ? $0 : $0 + [$1!] }) | |
split / flat / flat | |
results = split(arrayOfOptionals, isSeparator: {$0 == nil}).flatMap({$0}).flatMap({$0}) |
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