>> a: [[1 2] "a" a [3 3]]
== [[1 2] "a" a [3 3]]
>> collect [foreach x a [if block? x [keep x]]]
== [1 2 3 3]
But what I want is [[1 2] [3 3]]. It seems that collect/keep would flat the result(in term of block). How to prevent it?
How to prevent "collect/keep" function from flatting its result
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Use
keep/only. FYI,keephas almost the same semantics asappend(barring a few refinements) with an implicit block thatcollectprovides internally: see?? collectfor the details.