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                ## map與forEach的區別? 1、`forEach`方法,是最基本的方法,就是遍歷與循環,默認有3個傳參:分別是遍歷的數組內容`item`、數組索引`index`、和當前遍歷數組`Array` 2、`map`方法,基本用法與`forEach`一致,但是不同的,它會返回一個新的數組,所以在`callback`需要有`return`值,如果沒有,會返回`undefined`
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