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⚡️ Speed up function extract_order by 44% #624

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⚡️ Speed up function extract_order by 44% #624

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16 changes: 13 additions & 3 deletions marimo/_utils/cell_matching.py
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Original file line number Diff line number Diff line change
Expand Up @@ -48,10 +48,20 @@ def extract_order(
codes: list[str], lookup: dict[str, list[tuple[int, CellId_t]]]
) -> list[list[int]]:
offset = 0
order: list[list[int]] = [[]] * len(codes)
for i, code in enumerate(codes):
codes_len = len(codes)
order: list[list[int]] = [
None
] * codes_len # Avoid list multiplication with mutables
for i in range(codes_len):
code = codes[i]
dupes = len(lookup[code])
order[i] = [offset + j for j in range(dupes)]
if dupes == 0:
order[i] = []
else:
# Avoid extra range object overhead for empty cases
start = offset
stop = offset + dupes
order[i] = list(range(start, stop))
offset += dupes
return order

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