Question

我现在正在阅读fp的足够指南。但我无法弄清楚如何正确地编写这个函数。

const R = require('ramda');
const {IO, Future} = require('ramda-fantasy');

const read = () => IO(() => 'hello');
const write = (data) => IO(() => {
    console.log(data)
    return data;
});

const process = (data) => Future((reject, resolve) => {
  return setTimeout(() => resolve(data), 0);
});

组合功能的最佳方法是：read - ＆gt;过程 - ＆gt;写？

Answer 1

将ios更改为期货。

.nav li {
  list-style: none;
  position:relative;
}    
.subnav-block {
  position: absolute;
  width: 100% !important;
  top: 54px;
  left: 0;
  padding: 20px 0 !important;
  height: 140px;
  background: gray;
  opacity:0;
  visibillity:hidden;
  -webkit-transition: all 0.6s ease-in-out 0.15s;
  -moz-transition: all 0.6s ease-in-out 0.15s;
  -o-transition: all 0.6s ease-in-out 0.15s;
  -ms-transition: all 0.6s ease-in-out 0.15s;
  transition: all 0.6s ease-in-out 0.15s;
}

.nav > li:hover .subnav-block{
  opacity:1;
  visibilty:visiable;
}

未来就像异步ios，因此在两种类型之间提升之间没有多大意义。如果您真的想区别对待它们，可以按照bergi的建议将monad嵌套到IO>中。

功能javascript读取，异步，写入结果

1 个答案: