Swift filter array of objects

Question

class book{
    var nameOfBook: String!
}

var englishBooks=[book(),book(),book()]
var arr = englishBooks.filter {
    contains($0.nameOfBook, \"rt\")
}

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Answer 1

Sorry this is an old thread. Change you code slightly to properly init your variable 'nameOfBook'.

class book{
   var nameOfBook: String!
   init(name: String) {
      nameOfBook = name
   }
}

Then we can create an array of books.

var englishBooks = [book(name: "Big Nose"), book(name: "English Future 
Prime Minister"), book(name: "Phenomenon")]

The array's 'filter' function takes one argument and some logics, 'contains' function can take a simplest form of a string you are searching for.

let list1 = englishBooks.filter { (name) -> Bool in
   name.contains("English")
}

You can then print out list1 like so:

let list2 = arr1.map({ (book) -> String in
   return book.nameOfBook
})
print(list2)

// print ["English Future Prime Minister"]

Above two snippets can be written short hand like so:

let list3 = englishBooks.filter{ ($0.nameOfBook.contains("English")) }
print(list3.map({"\($0.nameOfBook!)"}))