Map and grep evaluate a block or an expression for each element of a list.
Map和grep对列表的每个元素计算块或表达式。
Keys can also be other JSON structures such as a list or a map.
键还可以是其他JSON结构，比如列表或映射。
The first, keys, is a list of keys that were created in the map function.
第一个参数是keys，这是在map函数中创建的键的列表。
A list of symbols used on the map is given in the index.
这份地图所使用的符号全部列在索引中。
We can check whether any speed differences exist between map , list comprehensions, and traditional loops.
我们可以看出map方法、list comprehension和传统循环方法之间的速度差别。
Listing 4 illustrates applying the collect method to a List and a Map.
清单4演示了把collect方法应用于List和Map。
Listing 4 illustrates applying the collect method to a List and a Map.
清单4演示了把collect方法应用于List和Map。
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