Remove Multiple Values from Every Sublist

Question

Given the following list of lists:

l:(1 2 3 4;7 2 4 1;1 3 5 1 8;0 8;8 2 4)

Return l with the numbers 2 and 0 removed from all sublists.

Expected result:

1 3 4
7 4 1
1 3 5 1 8
,8
8 4

Solution

l except\: (2;0)

Explanation

The each-left iterator:

\:

pairs a single right argument against every item on the left, one at a time. Here the right argument (2;0) stays fixed while except is applied between it and each sublist of l:

(1 2 3 4) except (2;0)
(7 2 4 1) except (2;0)
(1 3 5 1 8) except (2;0)
(0 8) except (2;0)
(8 2 4) except (2;0)

Each sublist has the values 2 and 0 removed independently, leaving the third sublist unchanged (it contains neither) and reducing 0 8 down to a single-item list, ,8.

each-left is the right tool whenever the same right-hand argument needs to be applied against every item of a list on the left.