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lazy-seq

lazy-seq

lazy-seq

lazy-seq

1

As the name suggests , the lazy-seq macro is used to create a lazy sequence .

正如其名字所暗示的，lazy-seq 宏被用来创建一个惰性序列。

2

However , the lazy-seq macro ensures that the function will only be invoked as the elements are accessed .

不过，lazy-seq 宏确保了此函数将只在元素被访问的时候调用。

3

In this case , the sequence is the result of again calling the lazy-seq-fibo function .

在本例中，此序列就是调用 lazy-seq-fibo 函数后的结果。

4

That expression is a recursive call to lazy-seq-fibo, but this time , it is calling the two argument case, passing in 0 and 1 to it .

该表达式是对 lazy-seq-fibo 的一个递归调用，不过这次，它调用的是有两个参数的情况，并向其传递 0 和 1 。

5

If this sequence was not lazy , the lazy-seq-fibo function would get called again and again.

如果这个序列不是惰性的，lazy-seq-fibo 函数就会一次又一次地被调用。

6

It is then using the lazy-seq macro .

然后它再使用 lazy-seq 宏。

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