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| − | == File data manipulation one-liners ==
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| − | * Given a file with a single number on each line, reach only the first 10 lines, sum the total and print each number read.
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| − | <syntaxhighlight lang="D">
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| − | module read_and_sum;
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| − |
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| − | import std.conv : to;
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| − | import std.stdio: writeln;
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| − | import std.range : takeExactly, tee;
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| − | import std.algorithm.iteration : map, each;
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| − |
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| − | void main()
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| − | {
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| − | double total = 0;
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| − | File("./10numbers.txt")
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| − | // lazily iterate by line
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| − | .byLine
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| − | // pick first 10 lines
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| − | .takeExactly(10)
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| − | // convert each to double
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| − | .map!(to!double)
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| − |
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| − | // add element ro total
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| − | .tee!((x) { total += x; })
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| − |
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| − | // print each number
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| − | .each!writeln;
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| − | }
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| − | </syntaxhighlight>
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