Shorthand to test if an object exists in an array for Swift?

by

Why not use the built-in contains() function? It comes in two flavors

func contains<S : SequenceType, L : BooleanType>(seq: S, predicate: @noescape (S.Generator.Element) -> L) -> Bool
func contains<S : SequenceType where S.Generator.Element : Equatable>(seq: S, x: S.Generator.Element) -> Bool

and the first one takes a predicate as argument.

if contains(myArr, { $0.name == "Def" }) {
    println("yes")
}

Update: As of Swift 2, both global contains() functions have
been replaced by protocol extension methods:

extension SequenceType where Generator.Element : Equatable {
    func contains(element: Self.Generator.Element) -> Bool
}

extension SequenceType {
    func contains(@noescape predicate: (Self.Generator.Element) -> Bool) -> Bool
}

and the first (predicate-based) one is used as:

if myArr.contains( { $0.name == "Def" }) {
    print("yes")
}

Swift 3:

if myArr.contains(where: { $0.name == "Def" }) {
    print("yes")
}

More Related Contents:

  1. Convert Dictionary to Array in swift
  2. Swift how to sort array of custom objects by property value
  3. How to check if an element is in an array
  4. Removing duplicate elements from an array in Swift
  5. How to sort an array of custom objects by property value in Swift
  6. How to iterate a loop with index and element in Swift
  7. How do I concatenate or merge arrays in Swift?
  8. Pick a random element from an array
  9. Sort Objects in Array by date
  10. How do I insert an element at the correct position into a sorted array in Swift?
  11. How to get list of common elements of 2 array in Swift?
  12. Swift sort an array with strings and numbers [duplicate]
  13. Flatten [Any] Array Swift
  14. How to remove an element from an array in Swift
  15. Swift: Pass array by reference?
  16. Is it possible to make an Array extension in Swift that is restricted to one class?
  17. Cannot convert value of type ‘Meme!’ to expected argument type ‘@noescape (Meme) throws -> Bool’
  18. Swift 3 2d array of Int
  19. Find Duplicate Elements In Array Using Swift
  20. How can I interleave two arrays?
  21. How do you create an immutable array in Swift?
  22. Swift 4 JSON Codable – value returned is sometimes an object, others an array
  23. Reorder array compared to another array in Swift [duplicate]
  24. swift: modifying arrays inside dictionaries
  25. How can I convert an array to a tuple?
  26. How to stable sort an array in swift?
  27. What does $0 and $1 mean in Swift Closures?
  28. How can I run through three separate arrays in the same for loop?
  29. Operation on an array of structs implementing Equatable
  30. How to convert UInt8 byte array to string in Swift

Leave a Comment