nsubstIfNot

Function: nsubstIfNot { new fn list -> list }

file: 10-C-lists.muf
package: muf
status: alpha

The nsubstIfNot function destructively modifies the given list by replacing all elements not satisfying fn by new. (As usual the n-for-nuke in the name signals a destructive list operation.)

Stack:
[ [ 'a' 'B' 'c' ]l [ 'D' 'e' 'f' ]l ]l --> list
Stack:
'_' :: upperCase? ; list nsubstIfNot printList
Stack: "[ [ '_' 'B' '_' ]l [ 'D' '_' '_' ]l ]l"

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