Returns true if and only if the input range range is non-empty and _any value found in range satisfies the predicate pred. Performs (at most) O(range.length) evaluations of pred.
import std.ascii : isWhite; assert( all!(any!isWhite)(["a a", "b b"])); assert(!any!(all!isWhite)(["a a", "b b"]));
any can also be used without a predicate, if its items can be evaluated to true or false in a conditional statement. !any can be a convenient way to quickly test that none of the elements of a range evaluate to true.
int[3] vals1 = [0, 0, 0]; assert(!any(vals1[])); //none of vals1 evaluate to true int[3] vals2 = [2, 0, 2]; assert( any(vals2[])); assert(!all(vals2[])); int[3] vals3 = [3, 3, 3]; assert( any(vals3[])); assert( all(vals3[]));
Checks if _any of the elements satisfies pred. !any can be used to verify that none of the elements satisfy pred. This is sometimes called exists in other languages.