feat: add helper to split an array into sized groups

src/helper/util.ts

@@ -8,3 +8,13 @@ export function camelCaseKeys<T>(obj: Data): T {
   }
   return out as T;
 }
+
+export function group<T>(arr: T[], size: number): T[][] {
+  const groups: T[][] = [];
+  const count = Math.ceil(arr.length / size);
+  for (let i = 0; i < count; ++i) {
+    groups.push(arr.slice(i * size, (i + 1) * size));
+  }
+
+  return groups;
+}

test/helper/util.test.ts

@@ -15,3 +15,28 @@ describe("camelCaseKeys()", () => {
     expect(util.camelCaseKeys(a)).toStrictEqual(b);
   });
 });
+
+describe("group()", () => {
+  it("should split an array into groups", () => {
+    const a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+    const b = [
+      [1, 2],
+      [3, 4],
+      [5, 6],
+      [7, 8],
+      [9, 10],
+    ];
+
+    expect(util.group(a, 2)).toStrictEqual(b);
+  });
+
+  it("should put the remainder into a group", () => {
+    const a = [1, 2, 3, 4, 5];
+    const b = [
+      [1, 2, 3],
+      [4, 5],
+    ];
+
+    expect(util.group(a, 3)).toStrictEqual(b);
+  });
+});