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                ### chunk 將數組塊劃分為指定大小的較小數組。 使用`Array.from()`創建新的數組, 這符合將生成的區塊數。使用`Array.slice()`將新數組的每個元素映射到`size`長度的區塊。如果原始數組不能均勻拆分, 則最終的塊將包含剩余的元素。 ~~~js const chunk = (arr, size) => Array.from({length: Math.ceil(arr.length / size)}, (v, i) => arr.slice(i * size, i * size + size)); // chunk([1,2,3,4,5], 2) -> [[1,2],[3,4],[5]] ~~~
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