85 lines
1.5 KiB
Plaintext
85 lines
1.5 KiB
Plaintext
import std.io;
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import std.time;
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import std.value;
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func benchmark(fn: Function, arg: Any) -> Null
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{
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io.println("Testing fn:", fn, "with arg:", arg);
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const start := time.now();
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const result := fn(arg);
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const end := time.now();
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const duration := new time.Time{
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end.since(start)
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};
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io.println("=" * 50);
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io.println("fn returns:", result, "\n");
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io.println("Cost:", duration.toSeconds(), "s");
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io.println(" ", duration.toMillis(), "ms");
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}
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var memo := {};
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func fib_memo(x)
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{
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if memo.contains(x)
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{
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return memo.get(x);
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}
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if x <= 1
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{
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memo[x] = x;
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return x;
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}
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var result := fib_memo(x - 1) + fib_memo(x - 2);
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memo[x] = result;
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return result;
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}
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func fib_iter(n)
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{
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var a := 0;
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var b := 1;
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for var i := 0; i < n; i = i + 1
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{
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var temp := a + b;
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a = b;
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b = temp;
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}
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return a;
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}
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func fib(x)
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{
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if x <= 1
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{
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return x;
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}
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return fib(x - 1) + fib(x - 2);
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}
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func fib_tail(n, a=0, b=1) {
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if n == 0 { return a; }
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if n == 1 { return b; }
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return fib_tail(n-1, b, a+b);
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}
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const n := 30;
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io.println("! fib(" + value.string_from(n) + "):");
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benchmark(fib, n);
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io.print("\n\n");
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io.println("! fib_memo(" + value.string_from(n) + "):");
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benchmark(fib_memo, n);
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io.print("\n\n");
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io.println("! fib_iter(" + value.string_from(n) + "):");
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benchmark(fib_iter, n);
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io.print("\n\n");
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io.println("! fib_tail(" + value.string_from(n) + "):");
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benchmark(fib_tail, n);
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io.print("\n\n");
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