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                ## mapSpread 方法可以迭代集合,將每個嵌套項值給指定的回調函數。該回調函數可以自由修改該集合項并返回,從而生成被修改過集合項的新集合 mapSpread 方法可以迭代集合,將每個嵌套項值給指定的回調函數。該回調函數可以自由修改該集合項并返回,從而生成被修改過集合項的新集合: ``` $collection = collect([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]); $chunks = $collection->chunk(2); $sequence = $chunks->mapSpread(function ($even, $odd) { return $even + $odd; }); $sequence->all(); // [1, 5, 9, 13, 17] ```
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