| 释义 |
- 1
Like filter , map evaluates the string passed as its second argument, passing each list element in turn, via v: val. 和filter一样，map计算作为第二个参数传递的字符串，并且通过v： val传递每个列表元素。 - 2
The call to map walks through each value, aliases it to v: val, evaluates the expression in the string, and replaces the value with the result of that expression. 调用map可以遍历各个值，将其作为别名赋给v： val，在字符串中计算表达式，并用表达式结果替换值。 - 3
The filter function works much the same way as for lists, except that in addition to testing each entry's value using v: val, you can also test its key using v: key. For example. filter函数的工作方法和列表中的相同，除了用v： val来检测各条目的值，您还可以用v： key来检测它的键。
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