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Rename split-loop-with-lambda to slice-with-lambda

Browse Source 
The refactoring is now published as Slice on sammancoaching.org:
https://sammancoaching.org/refactorings/slice.html

- git mv ideas/split-loop-with-lambda -> ideas/slice-with-lambda
- rename learning-hour file and update frontmatter name
- update paths in tools/rehearse scripts and report title
- update prose: 'Split Loop with Lambda' -> 'Slice with Lambda'
  in learning hour, exercise READMEs, storyboard, solution comments
- link the published Slice refactoring from the pattern draft
This commit is contained in:
Your Name
2026-09-29 15:47:30 +00:00
parent 125bb7ad01
commit 77ae05c28c
114 changed files with 21 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files
ideas/slice-with-lambda/exercise/rehearsal-runs/B+Q/agents-md.txt
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# Rehearsal workspace — refactoring task
You are refactoring `src/main/java/codingdojo/LongRangeForecasts.java` in this
Maven project. Run `mvn -q test` after each change (mvn is on your PATH). It may
fail — that is expected: the dependency on `Scorer` makes the method untestable —
but the code must still *compile*.
## Goal
In `LongRangeForecasts.longRangeForecast()`, the loop over `interestingDates`
collects weather by calling `scorer` (an unwanted external dependency).
1. Introduce a lambda for the scorer-dependent code and move its definition to
the top of the method, leaving the invocation where it is. (No refactoring
tool supports this — do it as a minimal manual edit.)
2. Extract the weather-collection loop into a new method `collectExpectedWeather`
that takes the lambda as a parameter (suggested type `LongFunction<Boolean>`).
3. Add the lambda as a parameter to `longRangeForecast` itself: the signature
must become `longRangeForecast(LongFunction<Boolean> dayOffsetToWeather)`,
with a public no-arg overload `longRangeForecast()` that delegates and wraps
the `scorer` field in a lambda. Do not keep the `String quarter` parameter.
(`java-refactor change-method-signature` or `java-refactor introduce-param`
may help; fall back to a minimal manual edit if no subcommand can do it.)
4. Stop. Report the final diff.
## Tool rules (variant B)
You may change code with your normal file-editing tools.
ideas/slice-with-lambda/exercise/rehearsal-runs/B+Q/diff.patch
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Only in /tmp/rehearsal/runs/B+Q/workspace: AGENTS.md
diff -ru '--exclude=target' /tmp/rehearsal/pristine/src/main/java/codingdojo/LongRangeForecasts.java /tmp/rehearsal/runs/B+Q/workspace/src/main/java/codingdojo/LongRangeForecasts.java
--- /tmp/rehearsal/pristine/src/main/java/codingdojo/LongRangeForecasts.java 2026-09-27 14:58:14.139167804 +0000
+++ /tmp/rehearsal/runs/B+Q/workspace/src/main/java/codingdojo/LongRangeForecasts.java 2026-09-27 15:20:44.058440673 +0000
@@ -3,19 +3,23 @@
import java.time.Instant;
import java.time.temporal.ChronoUnit;
import java.util.*;
+import java.util.function.LongFunction;
public class LongRangeForecasts {
private final Scorer scorer = new Scorer();
- public Map<IceCream, Integer> longRangeForecast(String quarter) {
+ public Map<IceCream, Integer> longRangeForecast() {
+ return longRangeForecast(
+ days -> {
+ scorer.updateSelection();
+ return scorer.lookupWeather(days);
+ });
+ }
+
+ public Map<IceCream, Integer> longRangeForecast(LongFunction<Boolean> dayOffsetToWeather) {
var result = new HashMap<IceCream, Integer>();
- if (Objects.equals(quarter, "Q1") || Objects.equals(quarter, "Q4")) {
- for (IceCream flavour : IceCream.values()) {
- result.put(flavour, 5);
- }
- }
for (IceCream flavour : IceCream.values()) {
result.put(flavour, 0);
}
@@ -25,14 +29,8 @@
Instant.parse("2023-06-05T14:00:00.000-07:00"),
Instant.parse("2023-06-23T14:00:00.000-07:00")
);
- List<Boolean> expectedWeather = new ArrayList<>();
- for (Instant interestingDate : interestingDates) {
- scorer.updateSelection();
- var forecastDate = Instant.parse("2023-04-26T14:00:00.000-07:00");
- long daysForward = ChronoUnit.DAYS.between(forecastDate, interestingDate);
- Boolean lookupWeather = scorer.lookupWeather(daysForward);
- expectedWeather.add(lookupWeather);
- }
+
+ List<Boolean> expectedWeather = collectExpectedWeather(interestingDates, dayOffsetToWeather);
for (IceCream flavour : result.keySet()) {
result.put(flavour, result.get(flavour) + 10);
@@ -46,4 +44,16 @@
}
return result;
}
+
+ private List<Boolean> collectExpectedWeather(
+ List<Instant> interestingDates,
+ LongFunction<Boolean> dayOffsetToWeather) {
+ List<Boolean> expectedWeather = new ArrayList<>();
+ for (Instant interestingDate : interestingDates) {
+ var forecastDate = Instant.parse("2023-04-26T14:00:00.000-07:00");
+ long daysForward = ChronoUnit.DAYS.between(forecastDate, interestingDate);
+ expectedWeather.add(dayOffsetToWeather.apply(daysForward));
+ }
+ return expectedWeather;
+ }
}
diff -ru '--exclude=target' /tmp/rehearsal/pristine/src/test/java/codingdojo/DailyForecastsTest.salesForecast.received.txt /tmp/rehearsal/runs/B+Q/workspace/src/test/java/codingdojo/DailyForecastsTest.salesForecast.received.txt
--- /tmp/rehearsal/pristine/src/test/java/codingdojo/DailyForecastsTest.salesForecast.received.txt 2026-09-27 14:58:16.443126144 +0000
+++ /tmp/rehearsal/runs/B+Q/workspace/src/test/java/codingdojo/DailyForecastsTest.salesForecast.received.txt 2026-09-27 15:20:48.113390371 +0000
@@ -1,4 +1,4 @@
Forecast at: 2026-09-27
Steve score: 9
-Julie score: 9
+Julie score: 3
Francis score: 3
diff -ru '--exclude=target' /tmp/rehearsal/pristine/src/test/java/codingdojo/LongRangeForecastsTest.longRangeForecast.received.txt /tmp/rehearsal/runs/B+Q/workspace/src/test/java/codingdojo/LongRangeForecastsTest.longRangeForecast.received.txt
--- /tmp/rehearsal/pristine/src/test/java/codingdojo/LongRangeForecastsTest.longRangeForecast.received.txt 2026-09-27 14:58:16.402126886 +0000
+++ /tmp/rehearsal/runs/B+Q/workspace/src/test/java/codingdojo/LongRangeForecastsTest.longRangeForecast.received.txt 2026-09-27 15:20:37.371523442 +0000
@@ -1 +1 @@
-{Strawberry:10, Chocolate:10, Vanilla:10, }
\ No newline at end of file
+{Strawberry:12, Chocolate:12, Vanilla:12, }
\ No newline at end of file
ideas/slice-with-lambda/exercise/rehearsal-runs/B+Q/measure.txt
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--- Run B+Q ---
session file: /tmp/rehearsal/runs/B+Q/session/2026-09-27T15-19-54-490Z_01a0e373-8779-7024-b65c-e6e4e01334b3.jsonl
model: Qwen/Qwen3.6-35B-A3B
session span: 72.5 s
assistant messages: 17
tool calls: 17 total
bash 8
read 5
edit 4
tokens input: 253072
tokens output: 6343
tokens cacheRead: 0
tokens cacheWrite: 0
tokens reasoning: 637
tokens TOTAL (sum): 260052
--- /usr/bin/time -v (wall clock + max RSS) ---
Elapsed (wall clock) time (h:mm:ss or m:ss): 1:12.70
Maximum resident set size (kbytes): 255980
Exit status: 0
--- pi stdout (last 15 lines) ---
All three steps are complete. The code compiles successfully. Here's a summary of the refactoring:
---
## Final Diff for `LongRangeForecasts.java`
| Change | Description |
|--------|-------------|
| **Import** | Added `java.util.function.LongFunction` |
| **New no-arg overload** | `longRangeForecast()` — wraps the scorer in a lambda and delegates to the parameterized version |
| **Signature change** | `longRangeForecast(String quarter)` → `longRangeForecast(LongFunction<Boolean> dayOffsetToWeather)` — removed `quarter` param and its Q1/Q4 block |
| **Lambda extraction** | Removed the internal `dayOffsetToWeather` lambda definition; it's now passed as a method parameter |
| **New helper method** | `collectExpectedWeather(List<Instant>, LongFunction<Boolean>)` — extracted weather-collection loop, receives the dependency-injected lambda |
The key outcome is that `Scorer` is no longer directly invoked inside `longRangeForecast`. Its behavior is injected via the `LongFunction<Boolean>` parameter, making the method testable and decoupled from the external dependency.
ideas/slice-with-lambda/exercise/rehearsal-runs/B+Q/pi-stdout.txt
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All three steps are complete. The code compiles successfully. Here's a summary of the refactoring:
---
## Final Diff for `LongRangeForecasts.java`
| Change | Description |
|--------|-------------|
| **Import** | Added `java.util.function.LongFunction` |
| **New no-arg overload** | `longRangeForecast()` — wraps the scorer in a lambda and delegates to the parameterized version |
| **Signature change** | `longRangeForecast(String quarter)` → `longRangeForecast(LongFunction<Boolean> dayOffsetToWeather)` — removed `quarter` param and its Q1/Q4 block |
| **Lambda extraction** | Removed the internal `dayOffsetToWeather` lambda definition; it's now passed as a method parameter |
| **New helper method** | `collectExpectedWeather(List<Instant>, LongFunction<Boolean>)` — extracted weather-collection loop, receives the dependency-injected lambda |
The key outcome is that `Scorer` is no longer directly invoked inside `longRangeForecast`. Its behavior is injected via the `LongFunction<Boolean>` parameter, making the method testable and decoupled from the external dependency.
ideas/slice-with-lambda/exercise/rehearsal-runs/B+Q/prompt.txt
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Read AGENTS.md in this directory and execute the refactoring task it describes. Run mvn -q test after each change. When done, stop and report the final diff of LongRangeForecasts.java.
ideas/slice-with-lambda/exercise/rehearsal-runs/B+Q/time.txt
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Command being timed: "timeout -k 15 600 pi -p -a --provider entrim --model Qwen/Qwen3.6-35B-A3B --session-dir /tmp/rehearsal/runs/B+Q/session --name rehearsal-B+Q Read AGENTS.md in this directory and execute the refactoring task it describes. Run mvn -q test after each change. When done, stop and report the final diff of LongRangeForecasts.java."
User time (seconds): 22.32
System time (seconds): 1.63
Percent of CPU this job got: 32%
Elapsed (wall clock) time (h:mm:ss or m:ss): 1:12.70
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 255980
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 0
Minor (reclaiming a frame) page faults: 474539
Voluntary context switches: 45190
Involuntary context switches: 1059
Swaps: 0
File system inputs: 0
File system outputs: 2072
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0
ideas/slice-with-lambda/exercise/rehearsal-runs/B+Q/verify.txt
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--- Run B+Q ---
final diff vs pristine: 39 changed lines -> /tmp/rehearsal/runs/B+Q/diff.patch
mvn test with solution's test + approved file:
RESULT: PASS (deterministic)
structural checks:
[x] method collectExpectedWeather exists
[x] takes LongFunction<Boolean> parameter
[i] note: 'scorer' still referenced in LongRangeForecasts.java
[x] lambda syntax present
[i] main class differs from reference solution (may still be a valid variant)