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Idiom # 247: Filter list in-place

See programming-idioms.org:

Code

# Fuzion lists are immutable, but Fuzion has some mutable data
# types as well. One is 'mutate.array' that provides a mutable array.
# Using 'mutate.array (option T)', we can remove elements by setting
# them to 'nil':
#
for i in x.indices do
if !(p x[i].get)
x[i] := nil
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Running Example

ex247 is
mi : mutate is
mi.instate_self ()->
x := (mutate.array (option i64)).new mi 100 nil
for i in x.indices do
x[i] := i
p i64 -> bool => i -> i %% 6
for i in x.indices do
if !(p x[i].get)
x[i] := nil
say x
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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last changed: 2024-07-01