Playground get state string

new_string_state.swift

import UIKit

enum MyContain {
    
    case before
    case after
    case between
    
}

class MyState {
    
    static private var instance:MyState?
    
    private var contains:[(min:Int,max:Int,string:String,contain:MyContain)] = [
        (min:0,max:0,string:"zero",contain:.between),
        (min:0,max:10,string:"one",contain:.after),
        (min:11,max:20,string:"two",contain:.between),
        (min:21,max:30,string:"three",contain:.between),
        (min:31,max:40,string:"four",contain:.between),
        (min:41,max:50,string:"five",contain:.before),
        (min:50,max:Int.max,string:"Limit",contain:.between)
    ]
    
    static func shared() -> MyState {
        if instance == nil {
            instance = MyState()
        }
        return instance!
    }
    
    func state(_ value:Int) -> String?{
        for item in contains {
            if self._getString(value: value, min: item.min, max: item.max, contain: item.contain) {
                return item.string
            }
        }
        return nil
    }
    
    private func _getString(value:Int,min:Int,max:Int,contain:MyContain) -> Bool{
        switch contain {
            
        case .before:
            return value >= min && value < max
            
        case .after:
            return value > min && value <= max
            
        case .between:
            return value >= min && value <= max
        }

    }
    
}

let str = MyState.shared().state(31)

//output
// four

string_array.swift

//: Playground - noun: a place where people can play

import UIKit

let state:[(range:[Int],name:String)] = [
    (range:Array(0...10),name:"one"),
    (range:Array(11...20),name:"two"),
    (range:Array(21...30),name:"three"),
    (range:Array(31...40),name:"four"),
    (range:Array(41..<50),name:"five")
]

let number = 11

let string = state.filter {
    $0.range.index(of: number) != nil
}

let str = state.flatMap { (range,string) -> String? in
    if range.index(of: number) != nil {
        return string
    }
    return nil
}


print(string)
print(str)

//output 
// [(range: [11, 12, 13, 14, 15, 16, 17, 18, 19, 20], name: "two")]
// ["two"]