[英]Get max and average values from an array of dictionaries swift
我有一个数组(由NSUserDefaults:Defaults.arrayForKey(“ onLine”)填充为[[String:AnyObject]]),如何从SPEED获取平均值和最大值?
我尝试了online.max![“ SPEED”],但是没有用
有帮助吗?
[[[“ LONGITUDE:”:-122.02211045,“ BEARING:”:263.41,“ LATITUDE:”:37.32475565,“ SPEED:”:3.76,“ TIMESTAMP:”:2016-10-19T02:09:49.535Z],[“ LONGITUDE:“:-122.02230437,” BEARING:“:270.15,” LATITUDE:“:37.32475499,” SPEED:“:3.15,” TIMESTAMP:“:2016-10-19T02:09:54.518Z],[” LONGITUDE:“ :-122.02249983,“ BEARING:”:265.56,“ LATITUDE:”:37.32475587,“ SPEED:”:3.27,“ TIMESTAMP:”:2016-10-19T02:09:59.516Z]]
我用这段代码修复了自己
speedArray.append(userLocation.speed * 1.94384)
let avgSpeed = speedArray.reduce(0, combine: +) / Double(speedArray.count)
let maxSpeed = speedArray.maxElement()
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