samdods

prefix func ~<A>(_ keyPath: KeyPath<A, Bool>) -> (A) -> Bool {
    return { $0[keyPath: keyPath] }
}

// only people with empty street in their address
people.filter(~\.address.street.isEmpty)

// the names of the people with empty street
people.filter(~\.address.street.isEmpty).map(~\.name)
// => ["Tom", "Alice", "Bob"]

samdods

prefix func ~<A, B>(_ keyPath: KeyPath<A, B>) -> (A, A) -> Bool where B: Comparable {
    return { $0[keyPath: keyPath] < $1[keyPath: keyPath] }
}

// sort in situ, by name
var p2 = people
p2.sort(by: ~\.name)

// people sorted by name
people.sorted(by: ~\.name)

samdods

prefix operator ~

prefix func ~<A, B>(_ keyPath: KeyPath<A, B>) -> (A) -> B {
    return { $0[keyPath: keyPath] }
}

// list of names for each person
people.map(~\.name)
// => ["Tom", "Dick", "Harry", "Alice", "Bob", "Charles"]

samdods

struct Address {
    let street: String
    let city: String
    let id: String?
}

struct Person {
    let name: String
    let address: Address
}

samdods

/// Prefix operator to turn a KeyPath into a function
prefix operator ~

/// Allows a key path to be passed into mapping functions
///
///     e.g. people.map(~\.name)
///
prefix func ~<A, B>(_ keyPath: KeyPath<A, B>) -> (A) -> B {
    return { $0[keyPath: keyPath] }
}

samdods

# sources
source 'https://github.com/CocoaPods/Specs.git'

# global config
platform :ios, '11.0'
use_frameworks!
workspace 'FunkySocial'

# methods to ensure the same version of each library is used across targets

samdods

import UIKit
import Common
import ProfileUI

samdods

<Workspace
   version = "1.0">
    <FileRef
    location = “group:FunkySocial/FunkySocial.xcodeproj”>
    </FileRef>
    <Group
    location = “container:”
    name = “Features”>
        <FileRef
        location = “group:NewsFeed/NewsFeed.xcodeproj”>

samdods

<FileRef
location = “group:FunkySocial/FunkySocial.xcodeproj”>
</FileRef>
<FileRef
location = “group:Common/Common.xcodeproj”>
</FileRef>

samdods

<FileRef
location = “group:Common/Common.xcodeproj”>
</FileRef>
<FileRef
location = “group:FunkySocial/FunkySocial.xcodeproj”>
</FileRef>