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Problem report: https://runestone.academy/ns/books/published/dwu-mth260-fa26/more-about-iteration_the-accumulator-pattern.html

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
72/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Active
Domain
content

Research direction

Start with the reported page and inspect Checkpoint 7.5.4, especially the hidden suffix on the line checking that students do not use len(). Confirm the extraneous right parenthesis in the source content, then verify the checkpoint no longer reports the syntax problem.

Written by the indexing model from the issue text.

Description

Content

A problem was reported through the Runestone "Report a Problem" form.

Field Value
Reporter jacobmenix
Email [email protected]
Course dwu-mth260-fa26
Page https://runestone.academy/ns/books/published/dwu-mth260-fa26/more-about-iteration_the-accumulator-pattern.html
Reported at 2026-10-01T15:14:48.627530
Description

Error in Checkpoint 7.5.4. There is an extraneous right parenthesis in the hidden suffix in the line that checks that students are not using the len() function.

Browser console log
[warn] No ad placements found.
[log] Timezone cookie matches, not sending timezone to server
[log] This page served by undefined
[log] triggering runestone:pre-login-complete
[log] Runestone pre-login complete
[log] Loading Runestone component: activecode
[log] Loading Runestone component: codelens
[log] Loading Runestone component: multiplechoice
[log] Loading Runestone component: answer
[log] Loading Runestone component: feedback
[log] Loading Runestone component: parsons
[log] before get hist
[log] before get hist
[log] before get hist
[log] before get hist
[log] before get hist
[log] before get hist
[log] before get hist
[log] adding video popouts
[log] setting up pretext
[log] SpliceWrapper: received message subject: undefined from iframe: unknown
[log] MathJax Ready -- dequeing a typesetting run for foppff_1_question7_5_5 undefined
[log] making a new scrubber
[log] Fake change event, skipping the log
[log] making a new scrubber
[log] Fake change event, skipping the log
[log] making a new scrubber
[log] Fake change event, skipping the log
[log] making a new scrubber
[log] Fake change event, skipping the log
[log] Response from server: 200
[log] Data from server: "no data" calling repopulateFromStorage
[log] resolving checkServer with server data
[log] making a new scrubber
[log] making a new scrubber
[log] Fake change event, skipping the log
[log] making a new scrubber
[log] Fake change event, skipping the log
[log] Response from server: 200
[log] Data from server: "no data" calling repopulateFromStorage
[log] resolving checkServer with server data
Dominant language
TypeScript
Stars
68
Forks
118
Avg merge
1d 13h
Merged PRs (30d)
19

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