swift 开发神兵利器，Dollar

官网地址：​​https://github.com/ankurp/Dollar​​

 

Dollar 是一个第三方扩展。

包括了。Array，Dictionary，Object，Function，Chaining

导入Dollar 直接使用即可

数组扩展操作

func dollarArrayTest(){
    //取对应数组 组成新的数组
    print(Dollar.at(["ant","bat","cat","dog","egg"], indexes: [0,2,4]))
    //分成多个数组
    print(Dollar.chunk([1,2,3,4],size: 2))
    print(Dollar.chunk([1,2,3,4],size: 3))
    //找出第二个数组中。第一个数组没有的值
    print(Dollar.difference([1,2,3,4,5],[5,2,10]))
    //根据条件和array分组
    print(Dollar.groupBy([1,2,3,4,5], callback: {$0 % 2 }))
    //得到数组出现的次数
    print(Dollar.frequencies(["a","d","c","a","d","v"]))
    //得到数组最大公约数
    print(Dollar.gcd(3,9))
    //计算交集
    print(Dollar.intersection([1,2,3],[5,2,1,4],[2,1]))
    //计算并集
    print(Dollar.union([1,2,3],[1,23,3]))
    //得到数组最小公倍数
    print(Dollar.lcm(3, 9))
    //配对组合新 出租
    print(Dollar.transpose([[1,2,3],[4,5,6]]))
}

输出结果

2020-09-11 22:45:37.001952+0800 安果视频壁纸[6488:367125] [Storyboard] Unknown class Ma in Interface Builder file.
["ant", "cat", "egg"]
[[1, 2], [3, 4]]
[[1, 2, 3], [4]]
[1, 3, 4]
[0: [2, 4], 1: [1, 3, 5]]
["a": 2, "v": 1, "d": 2, "c": 1]
3
[2, 1]
[1, 2, 3, 23]
9
[[1, 4], [2, 5], [3, 6]]

字典扩展操作。

func dollarDictTest(){
    let dict:Dictionary<String,Int> = ["Dog":1,"Cat":2]
    let dict2:Dictionary<String,Int> = ["Cow":3]
    let dict3:Dictionary<String,Int> = ["Sheep":4]
    //合并
    print(Dollar.merge(dict,dict2,dict3))
    // 选择
    print(Dollar.pick(["Dog":1,"Cat":2,"Cow":3], keys: "Dog","Cow"))
    //省略
    print(Dollar.omit(["Dog":1,"Cat":2,"Cow":3], keys: "Cat","Dog"))
}

结果

字典扩展
["Dog": 1, "Cat": 2, "Cow": 3, "Sheep": 4]
["Dog": 1, "Cow": 3]
["Cow": 3]

科里化 curry

func dollarFunctest(){
    let curriedAdder = Dollar.curry(adder)
    let addTenAnd = curriedAdder(10)
    let addThirtyAnd = addTenAnd(20)
    print(addThirtyAnd(1))
     print(addThirtyAnd(50))
         print(addTenAnd(10)(10))
}

 

结果

curry 
31
80
30