lodash map

_.map(collection, [iteratee=_.identity])

建立一個通過 iteratee 處理的集合中每個元素的結果數組。 iteratee 會傳入3個參數:(value, index|key, collection)。 javascript

 

 

<!DOCTYPE html>
<html lang="zh">

    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <meta http-equiv="X-UA-Compatible" content="ie=edge" />
        <title>map</title>
    </head>

    <body>
        <script src="https://cdn.bootcss.com/lodash.js/4.17.10/lodash.min.js"></script>
        <script type="text/javascript">
            function square(n) { return n * n; } console.log(_.map([4, 8], square)); //[16,64]
            var users = [{ 'user': 'barney' }, { 'user': 'fred' } ]; console.log(_.map(users, 'user')); //['barney','fred']
        </script>
    </body>

</html>
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