Question

我是新来的，所以如果我错误地格式化了这个（也是swift的新手），请更正我，但基本上我想要做的是采用一系列日期和数字，如果有任何日期是同样将数字合并为一个条目。

所以这个

//This is how i format the data after i pull it from core data
var dateAndEntry = [(String, Double)]

//i've split them into two seperate arrays for sorting, but I feel like theres a better way i don't know
var dates = ["01/01/2016", "02/01/2016", "02/01/2016", "04/01/2016", "05/01/2016", "06/01/2016","07/01/2016","07/01/2016"]
var entries = [-14,2,8,9,-1,8,25,6]

变成这个

var dates = ["01/01/2016", "02/01/2016", "04/01/2016", "05/01/2016", "06/01/2016","07/01/2016"]
var entries = [-14,10,9,-1,8,19]

我试过这样做但我只能得到它以便它创建一个只包含新值的新数组，而不是允许我获取重复值，组合，插入索引然后删除原始条目这两个阵列。

func combineDuplicates(dates: [String]) -> [String]{
    var output: [String] = []
    var checked = Set<String>()
    for date in dates {

        if !checked.contains(date) {
            checked.insert(date)
            output.append(date)
        }
    }
    print(output)
    return output
}

let sorted = combineDuplicates(dates)
print(sorted)

是的，我已经在谷歌和这里寻找答案，但没有找到任何答案。

任何有关我可能错过的其他问题或来源的解决方案，解释，帮助，指示或参考都将不胜感激。

Answer 1

这将为您提供一个字典，其中包含日期和值，每个日期的条目总和：

dates.enumerate().reduce([String:Int]()) { dict, item in
    var dict = dict
    dict[item.1] = (dict[item.1] ?? 0) + entries[item.0]
    return dict
}
// ["06/01/2016": 8, "04/01/2016": 9, "01/01/2016": -14, "05/01/2016": -1, "07/01/2016": 31, "02/01/2016": 10]

查找并组合数组中的重复条目

1 个答案: