Revision control
Copy as Markdown
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
import Foundation
public extension Dictionary {
func mapKeysNotNull<K1>(_ transform: (Key) -> K1?) -> [K1: Value] {
let transformed: [(K1, Value)] = compactMap { k, v in
transform(k).flatMap { ($0, v) }
}
return [K1: Value](uniqueKeysWithValues: transformed)
}
@inline(__always)
func mapValuesNotNull<V1>(_ transform: (Value) -> V1?) -> [Key: V1] {
return compactMapValues(transform)
}
func mapEntriesNotNull<K1, V1>(_ keyTransform: (Key) -> K1?, _ valueTransform: (Value) -> V1?) -> [K1: V1] {
let transformed: [(K1, V1)] = compactMap { k, v in
guard let k1 = keyTransform(k),
let v1 = valueTransform(v)
else {
return nil
}
return (k1, v1)
}
return [K1: V1](uniqueKeysWithValues: transformed)
}
func mergeWith(_ defaults: [Key: Value], _ valueMerger: ((Value, Value) -> Value)? = nil) -> [Key: Value] {
guard let valueMerger = valueMerger else {
return merging(defaults, uniquingKeysWith: { override, _ in override })
}
return merging(defaults, uniquingKeysWith: valueMerger)
}
}
public extension Array {
@inline(__always)
func mapNotNull<ElementOfResult>(_ transform: (Element) throws -> ElementOfResult?) rethrows -> [ElementOfResult] {
try compactMap(transform)
}
}
/// Convenience extensions to make working elements coming from the `Variables`
/// object slightly easier/regular.
public extension String {
func map<V>(_ transform: (Self) throws -> V?) rethrows -> V? {
return try transform(self)
}
}
public extension Variables {
func map<V>(_ transform: (Self) throws -> V) rethrows -> V {
return try transform(self)
}
}