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

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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
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ideas/slice-with-lambda/exercise/rehearsal-runs/C/pi-stdout.txt
+92
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@@ -0,0 +1,92 @@
All four steps are complete. Here's the summary:
## What was done
1. **Lambda introduced** (manual edit): the `scorer.updateSelection()` + `scorer.lookupWeather(...)` code became a `LongFunction<Boolean> dayOffsetToWeather` lambda defined at the top of the method; the loop now calls `dayOffsetToWeather.apply(daysForward)`.
2. **Extracted** the weather-collection loop with `java-refactor extract` (the tool generated `collectExpectedWeather(interestingDates, dayOffsetToWeather, expectedWeather)`), then a minimal manual cleanup gave it the suggested shape `private List<Boolean> collectExpectedWeather(LongFunction<Boolean> dayOffsetToWeather)` returning the list.
3. **Signature changed** (manual edit — neither `change-method-signature` nor `introduce-param` supports removing the `quarter` parameter): now `public Map<IceCream, Integer> longRangeForecast(LongFunction<Boolean> dayOffsetToWeather)` plus a public no-arg overload delegating with a lambda wrapping the `scorer` field. The `quarter` branch was dropped (it was inert anyway — its `put(flavour, 5)` was immediately overwritten by `put(flavour, 0)`), and the test call site updated to `longRangeForecast()`.
4. `mvn -q test` was run after every change: code compiles throughout; the 2 remaining failures (`LongRangeForecastsTest`, `DailyForecastsTest`) are the expected pre-existing ones caused by the `Scorer` state dependency.
## Final diff — `src/main/java/codingdojo/LongRangeForecasts.java`
```diff
@@ -3,36 +3,26 @@
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(daysForward -> {
+ scorer.updateSelection();
+ return scorer.lookupWeather(daysForward);
+ });
+ }
+
+ 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);
}
- List<Instant> interestingDates = List.of(
- Instant.parse("2023-05-01T14:00:00.000-07:00"),
- Instant.parse("2023-05-18T14:00:00.000-07:00"),
- 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);
- }
+ var expectedWeather = collectExpectedWeather(dayOffsetToWeather);
for (IceCream flavour : result.keySet()) {
result.put(flavour, result.get(flavour) + 10);
@@ -46,4 +36,21 @@
}
return result;
}
+
+ private List<Boolean> collectExpectedWeather(LongFunction<Boolean> dayOffsetToWeather) {
+ List<Instant> interestingDates = List.of(
+ Instant.parse("2023-05-01T14:00:00.000-07:00"),
+ Instant.parse("2023-05-18T14:00:00.000-07:00"),
+ 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) {
+ var forecastDate = Instant.parse("2023-04-26T14:00:00.000-07:00");
+ long daysForward = ChronoUnit.DAYS.between(forecastDate, interestingDate);
+ Boolean lookupWeather = dayOffsetToWeather.apply(daysForward);
+ expectedWeather.add(lookupWeather);
+ }
+ return expectedWeather;
+ }
}
```
Supporting change in `src/test/java/codingdojo/LongRangeForecastsTest.java`:
```diff
- var quarter = "Q3";
- var actual = new LongRangeForecasts().longRangeForecast(quarter);
+ var actual = new LongRangeForecasts().longRangeForecast();
```
Stopping here as instructed.