Zhentiw - 博客园

2019年2月24日

[Algorithm] Count Negative Integers in Row/Column-Wise Sorted Matrix

摘要： Each row and each column are already SORTED in the given matrix! 阅读全文

posted @ 2019-02-24 20:56 Zhentiw 阅读(194) 评论(0) 推荐(0)

摘要： In this post, we are going to see how to use Ramda Lens. For example, we have data: R.lens: R.lens takes a getter and a setter: R.lensProp: There is a 阅读全文

posted @ 2019-02-24 20:12 Zhentiw 阅读(758) 评论(0) 推荐(0)

[React] Use the useReducer Hook and Dispatch Actions to Update State (useReducer, useMemo, useEffect)

摘要： As an alternate to useState, you could also use the useReducer hook that provides state and a dispatch method for triggering actions. In this lesson, 阅读全文

posted @ 2019-02-24 17:28 Zhentiw 阅读(483) 评论(0) 推荐(0)

2019年2月23日

[Functional Programming] Pointy Functor Factory

摘要： A pointed functor is a functor with an of method What's important here is the ability to drop any value in our type and start mapping away. The benifi 阅读全文

posted @ 2019-02-23 19:37 Zhentiw 阅读(258) 评论(0) 推荐(0)

[Functional Programming] Async IO Functor

摘要： We will see a peculiar example of a pure function. This function contained a side-effect, but we dubbed it pure by wrapping its action in another func 阅读全文

posted @ 2019-02-23 19:28 Zhentiw 阅读(280) 评论(0) 推荐(0)

2019年2月22日

[Functional Programming] Write simple Semigroups type

摘要： An introduction to concatting items via the formal Semi-group interface. Semi-groups are simply a type with a concat method that are associative. We d 阅读全文

posted @ 2019-02-22 17:17 Zhentiw 阅读(261) 评论(0) 推荐(0)

[Functional Programming] Function signature

摘要： It is really important to understand function signature in functional programming. The the code example below: 'map' is pointfree version of any founc 阅读全文

posted @ 2019-02-22 04:45 Zhentiw 阅读(277) 评论(0) 推荐(0)

2019年2月21日

[React] Safely setState on a Mounted React Component through the useEffect Hook

摘要： In the class version of this component, we had a method called safeSetState which would check whether the component was still mounted before trying to 阅读全文

posted @ 2019-02-21 01:23 Zhentiw 阅读(887) 评论(0) 推荐(0)

2019年2月20日

[Transducer] Step by Step to build a simple transducer

摘要： Transducers are composable algorithmic transformations. They are independent from the context of their input and output sources and specify only the e 阅读全文

posted @ 2019-02-20 20:54 Zhentiw 阅读(339) 评论(0) 推荐(0)

2019年2月19日

[React] Ensure all React useEffect Effects Run Synchronously in Tests with react-testing-library

摘要： Thanks to react-testing-library our tests are free of implementation details, so when we refactor components to hooks we generally don't need to make 阅读全文

posted @ 2019-02-19 22:53 Zhentiw 阅读(1244) 评论(0) 推荐(0)

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