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// retoor <retoor@molodetz.nl>
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import "scheduler" for Scheduler, Future
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class DataProcessor {
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static parse { async { |text| text.split(",") } }
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static filter { async { |list, fn|
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var result = []
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for (item in list) {
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if (fn.call(item)) result.add(item)
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}
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return result
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}}
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static transform { async { |list, fn|
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var result = []
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for (item in list) {
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result.add(fn.call(item))
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}
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return result
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}}
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static join { async { |list, sep| list.join(sep) } }
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static pipeline(data) {
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var parse = DataProcessor.parse
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var filter = DataProcessor.filter
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var transform = DataProcessor.transform
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var join = DataProcessor.join
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var parsed = await parse(data)
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var filtered = await filter(parsed) { |s| s.count > 4 }
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var transformed = await transform(filtered) { |s| s.toList[0] }
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return await join(transformed, "-")
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}
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}
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var data = "apple,banana,cherry,date"
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var parse = DataProcessor.parse
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var parsed = await parse(data)
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System.print(parsed) // expect: [apple, banana, cherry, date]
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var filter = DataProcessor.filter
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var filtered = await filter(parsed) { |s| s.count > 5 }
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System.print(filtered) // expect: [banana, cherry]
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var transform = DataProcessor.transform
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var transformed = await transform(filtered) { |s| s.toList[0] }
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System.print(transformed) // expect: [b, c]
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var join = DataProcessor.join
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var joined = await join(transformed, "-")
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System.print(joined) // expect: b-c
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var result = DataProcessor.pipeline("one,two,three,four,five")
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System.print(result) // expect: t
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