Push ifs up and fors down: The idiom, its algebra, and its limits
When splitting a large function, try to keep all switch/if statements in the "parent" function, and move non-branchy logic fragments to helper functions. All control flow should be handled by one function, the rest shouldn't care about control flow at all. The programming heuristic push-ifs-up-fors-down suggests that conditional logic (if statements) should be moved upward (towards the caller or earlier in a pipeline), while iterative loops (for operations) should be pushed downward (toward batch processing or later in a tight branch-free loop).
- ▪When splitting a large function, try to keep all switch/if statements in the "parent" function, and move non-branchy logic fragments to helper functions.
- ▪All control flow should be handled by one function, the rest shouldn't care about control flow at all.
- ▪The programming heuristic push-ifs-up-fors-down suggests that conditional logic (if statements) should be moved upward (towards the caller or earlier in a pipeline), while iterative loops (for operations) should be pushed downward (toward b
Hacker News (Front Page) files mainly under programming. We currently carry 2,577 of its stories. Top-voted stories on Hacker News.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | Github |
| Canonical URL | https://debasishg.github.io/blog/push-ifs-up-fors-down/ |
| Publication time | Wed, 07 Oct 2026 18:43:18 +0000 |
| Retrieval time | 2026-10-07T20:57:28.885Z |
| Last seen | 2026-10-07T20:57:28.885Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | 8NFAWAvDectb · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Push Ifs Up and Fors Down: The Idiom, Its Algebra, and Its Limits Table of contents Introduction Analogy in Database Queries: Projections Early, Joins Late Analogy in Functional Programming and Category Theory Pushing-Ifs-Up as a Restriction to a Subobject Filter, Map and the Law That Relates Them Summary Push Ifs Up and Fors Down: The Idiom, Its Algebra, and Its Limits Introduction One of the recommendations from the Tiger Style document of TigerBeetle .. Centralize control flow. When splitting a large function, try to keep all switch/if statements in the "parent" function, and move non-branchy logic fragments to helper functions. Divide responsibility. All control flow should be handled by one function, the rest shouldn't care about control flow at all.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at Github.
Discussion
0 commentsMore from Github
