Note: If the keys are numeric, all elements will get new keys, starting from 0 and increases by 1. (See example 2).

注意：如果每个元素对应的键是数值型，那么剩下的元素将重新获得新的数值键，且从0开始以基数1递增(见案例2)。

youdao

Tip: Remember that if you skip the key when you specify an array, an integer key is generated, starting at 0 and increases by 1 for each value. (See example 3)?

提示：还记得吗？你过你忽略了指定函数中的键，将产生一个整数；且这些函数从“0”开始递增，每一个值增加“1”。(看案例3)？

youdao

In the example of Listing 1, new elements are always appended at the end, and therefore numbers_out's cardinality increases by 1 each time an element is added as shown in line 18.

清单1示例中，新的元素总是附加在末尾，因此每次添加一个元素，numbers_out的基数就增加1，如第18行所示。

youdao

And unlike n, l can start all the way down at 0, and it increases by integer value, so we go 1, 2, 3, and all the way up.

不像n，l可以从0开始取，然后每次增加一个整数，所以我们可以去1，2，3，一直下去。

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