Swift之过滤器(filter)

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let array = Array(5...25)
var anotherArray = [Int]()

for i in array{
    if i > 20{
       anotherArray.append(i)
    }
}
print(anotherArray) //[21, 22, 23, 24, 25]

let secondArray = array.filter { (i: Int) -> Bool in
    return i > 20  //注意：根据需求在闭包内进行相应的操作。
}
print(secondArray) //[21, 22, 23, 24, 25]

let thirdArray = array.filter ({$0 > 20})
print(thirdArray) // [21, 22, 23, 24, 25]

var people = [
    ["First": "JohnMusk", "Last": "Doe"],
    ["First": "Steve", "Last": "Jobs"],
    ["First": "Elon", "Last": "Musk"]
]

var searchText = "Musk"
var searchResults = people.filter{
   
    var firstName = $0["First"]!.lowercaseString
    var lastName = $0["Last"]!.lowercaseString
   
    return firstName.rangeOfString(searchText.lowercaseString) != nil
        || lastName.rangeOfString(searchText.lowercaseString) != nil
   
}
print(searchResults)
//[["First": "JohnMusk", "Last": "Doe"], ["First": "Elon", "Last": "Musk"]]

let searchResult = people.filter{
   
    var found = false
    let searText = "Musk"
    for str in $0.values {
        found = str.lowercaseString.rangeOfString(searText.lowercaseString) != nil
        if found {
            break
        }
    }
    return found
}
print(searchResult)
//[["First": "JohnMusk", "Last": "Doe"], ["First": "Elon", "Last": "Musk"]]

let firstNameQuery = "jo"
let lastNameQuery = "mus"

let predicate = NSPredicate(format: "%K CONTAINS[cd] %@ OR %K CONTAINS[cd] %@", "First", firstNameQuery, "Last", lastNameQuery)
let sorted = people.filter({
    return predicate.evaluateWithObject($0)
})
print(sorted)
//[["First": "JohnMusk", "Last": "Doe"], ["First": "Elon", "Last": "Musk"]]

Swift之过滤器(filter)

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原文地址：http://blog.csdn.net/longshihua/article/details/51363482