[Ramda] Convert a QueryString to an Object using Function Composition in Ramda

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于 2017-01-20 16:50:00 发布

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文章标签： javascript ViewUI

原文链接：http://www.cnblogs.com/Answer1215/p/6323273.html

本文介绍如何使用Ramda库中的工具函数将包含名称/值对的查询字符串转换为JavaScript对象，以便更方便地使用这些属性。通过组合使用tail、split、map和fromPairs等函数，我们能够有效地解析查询字符串。

In this lesson we'll use a handful of Ramda's utility functions to take a queryString full of name/value pairs and covert it into a JavaScript object so we can access those properties in a more useful way. Along the way, we'll build up a composition and look at the tail, split, map and fromPairs functions, along with the crucial composefunction.

const {compose, fromPairs, map, split, tail} = R

const queryString = '?page=2&pageSize=10&total=203'

const parseQs = compose(
    fromPairs, // {"page":"2","pageSize":"10","total":"203"}
    map(split('=')), // [["page","2"],["pageSize","10"],["total","203"]]
    split('&'), // ["page=2","pageSize=10","total=203"]
    tail // "page=2&pageSize=10&total=203"
    )

const result = parseQs(queryString)
console.log(result)