compact

1 import optional: no, some;
2 import ddash.utils: isFalsey;
3 assert([0, 1, 2, 0, 3].compact!(isFalsey).equal([1, 2, 3]));
4 assert([[1], [], [2]].compact!isFalsey.equal([[1], [2]]));
5 assert([some(2), no!int].compact!isFalsey.equal([some(2)]));
6 
7 class C {
8     int i;
9     this(int i) { this.i = i; }
10 }
11 
12 import std.algorithm: map;
13 auto arr = [new C(1), null, new C(2), null];
14 assert(arr.compact.map!(a => a.i).equal([1, 2]));