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</pre>
''Output is from the sample of the task.''
=={{header|Swift}}==
{{trans|Rust}}
<lang swift>import Foundation
let fmtDbl = { String(format: "%10.3f", $0) }
Task.detached {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
let (data, _) = try await URLSession.shared.bytes(from: URL(fileURLWithPath: CommandLine.arguments[1]))
var rowStats = [(Date, Double, Int)]()
var invalidPeriods = 0
var invalidStart: Date?
var sumFile = 0.0
var readings = 0
var longestInvalid = 0
var longestInvalidStart: Date?
var longestInvalidEnd: Date?
for try await line in data.lines {
let lineSplit = line.components(separatedBy: "\t")
guard !lineSplit.isEmpty, let date = formatter.date(from: lineSplit[0]) else {
fatalError("Invalid date \(lineSplit[0])")
}
let data = Array(lineSplit.dropFirst())
let parsed = stride(from: 0, to: data.endIndex, by: 2).map({idx -> (Double, Int) in
let slice = data[idx..<idx+2]
return (Double(slice[idx]) ?? 0, Int(slice[idx+1]) ?? 0)
})
var sum = 0.0
var numValid = 0
for (val, flag) in parsed {
if flag <= 0 {
if invalidStart == nil {
invalidStart = date
}
invalidPeriods += 1
} else {
if invalidPeriods > longestInvalid {
longestInvalid = invalidPeriods
longestInvalidStart = invalidStart
longestInvalidEnd = date
}
sumFile += val
sum += val
numValid += 1
readings += 1
invalidPeriods = 0
invalidStart = nil
}
}
if numValid != 0 {
rowStats.append((date, sum / Double(numValid), parsed.count - numValid))
}
}
for stat in rowStats.lazy.reversed().prefix(5) {
print("\(stat.0): Average: \(fmtDbl(stat.1)); Valid Readings: \(24 - stat.2); Invalid Readings: \(stat.2)")
}
print("""
Sum File: \(fmtDbl(sumFile))
Average: \(fmtDbl(sumFile / Double(readings)))
Readings: \(readings)
Longest Invalid: \(longestInvalid) (\(longestInvalidStart!) - \(longestInvalidEnd!))
""")
exit(0)
}
dispatchMain()
</lang>
{{out}}
<pre>2004-12-31 05:00:00 +0000: Average: 2.057; Valid Readings: 23; Invalid Readings: 1
2004-12-30 05:00:00 +0000: Average: 2.839; Valid Readings: 23; Invalid Readings: 1
2004-12-29 05:00:00 +0000: Average: 2.448; Valid Readings: 23; Invalid Readings: 1
2004-12-28 05:00:00 +0000: Average: 3.383; Valid Readings: 23; Invalid Readings: 1
2004-12-27 05:00:00 +0000: Average: 2.483; Valid Readings: 23; Invalid Readings: 1
Sum File: 1358393.400
Average: 10.497
Readings: 129403
Longest Invalid: 589 (1993-02-09 05:00:00 +0000 - 1993-03-05 05:00:00 +0000)</pre>
=={{header|Tcl}}==
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