Returns the number of times test return true in the list.
Since: 3.3
Parameters
lt: The list.test: A testing function.
Examples
points = [[7, 2, 2], [1, 1, 2], [3, 4, 2], [3, 4, 2], [1, 2, 3]];
assert(count(points, function(p) norm(p) > 5) == 3);