ddash.functional.cond

1 alias lessThanZero = (a) => a < 0;
2 alias greaterOrEqualThan10 = (a) => a >= 10;
3 alias identity = (a) => a;
4 alias negate = (a) => -a;
5 
6 alias abs = cond!(
7     a => a == 1, 42,
8     2, a => a * 2,
9     3, 999,
10     lessThanZero, negate,
11     greaterOrEqualThan10, identity,
12     a => a * 100,
13 );
14 
15 assert(abs(1) == 42);
16 assert(abs(2) == 4);
17 assert(abs(3) == 999);
18 assert(abs(4) == 400);
19 assert(abs(5) == 500);
20 assert(abs(-3) == 3);
21 assert(abs(11) == 11);
22 
23 alias str = cond!(
24     a => a < 1, "1",
25     a => a < 5, "5",
26     a => a < 10, "10",
27     "moar"
28 );
29 
30 assert(str(0) == "1");
31 assert(str(2) == "5");
32 assert(str(7) == "10");
33 assert(str(11) == "moar");