“& 1"代表什么?lix剂功能是什么意思? [英] What does "&1" mean in elixir function?

问题描述

使用此功能，& 1 指的是什么?

Given this function, what does &1 refer to?

Enum.map [1, 2, 3, 4], &(&1 * 2)

推荐答案

& 1 引用回调函数将接收的第一个参数.和号本身(& )是捕获功能的简写.这就是您可以扩展该功能的方式.

&1 refers to the first argument the callback function would receive. The ampersand by itself (&) is a shorthand for a captured function. This is how you could expand that function.

Enum.map([1, 2, 3, 4], fn x -> x * 2 end)

fn-> 等于&(......

x->x 等于 ...(& 1

可以在此处

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