feat: Introduce movingWindow in fp

ogre-works · Jan 15, 2023 · 1f212c0 · 1f212c0
1 parent 88f0617
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diff --git a/packages/fp/src/movingWindow/movingWindow.js b/packages/fp/src/movingWindow/movingWindow.js
@@ -0,0 +1,8 @@
+export default windowSize => things =>
+  things.reduce(
+    (accumulated, currentThing, index, allThings) =>
+      index > allThings.length - windowSize
+        ? accumulated
+        : [...accumulated, allThings.slice(index, index + windowSize)],
+    [],
+  );
diff --git a/packages/fp/src/movingWindow/movingWindow.test.js b/packages/fp/src/movingWindow/movingWindow.test.js
@@ -0,0 +1,13 @@
+import movingWindow from './movingWindow';
+
+describe('movingWindow', () => {
+  it('iterates an n-width window through an array', () => {
+    const actual = movingWindow(3)([1, 2, 3, 4, 5]);
+
+    expect(actual).toEqual([
+      [1, 2, 3],
+      [2, 3, 4],
+      [3, 4, 5],
+    ]);
+  });
+});