Zhentiw - 博客园

2019年2月26日

[Functional Programming] Capture Side Effects in a Task / Async

摘要： We examine the data structure Task, see some constructors, familiar methods, and finally how it captures side effects through laziness. We are going t 阅读全文

posted @ 2019-02-26 18:34 Zhentiw 阅读(277) 评论(0) 推荐(0)

[Compose] 9. Delay Evaluation with LazyBox

摘要： We rewrite the Box example using lazy evaulation. Here is Box example: So how to make it as Lazy Box? The Answer is instead of passing a value to the 阅读全文

posted @ 2019-02-26 18:11 Zhentiw 阅读(370) 评论(0) 推荐(0)

[Functional Programming] Unbox types with foldMap

摘要： Previously we have seen how to use Concat with reduce: To simply this, we can use 'fold': Javascript arrray doesn't have 'fold' so we use immutable-ex 阅读全文

posted @ 2019-02-26 18:05 Zhentiw 阅读(228) 评论(0) 推荐(0)

2019年2月25日

[Functional Programming] Working with two functors（Applicative Functors）-- Part1 --.ap

摘要： What is applicative functor: the ability to apply functors to each other. For example we have tow functors: Container(2), Container(3) We cannot just 阅读全文

posted @ 2019-02-25 19:12 Zhentiw 阅读(249) 评论(0) 推荐(0)

[React] Preventing extra re-rendering with function component by using React.memo and useCallback

摘要： Got the idea form this lesson. Not sure whether it is the ncessary, no othere better way to handle it. Have a TodoList component, every time types in 阅读全文

posted @ 2019-02-25 17:30 Zhentiw 阅读(701) 评论(0) 推荐(0)

2019年2月24日

[JS Compose] 7. Ensure failsafe combination using monoids

摘要： monoids is a semi-group with a neutral element. A semigroup, it does not have an element to return so it's not a safe operation, whereas with the mono 阅读全文

posted @ 2019-02-24 21:18 Zhentiw 阅读(299) 评论(0) 推荐(0)

[Functional Programming] Monad

摘要： Before we introduce what is Monad, first let's recap what is a pointed functor: A pointed functor is a Functor with .of() method Why pointed Functor i 阅读全文

posted @ 2019-02-24 21:11 Zhentiw 阅读(472) 评论(0) 推荐(0)

[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(181) 评论(0) 推荐(0)

[Ramda] Lens in Depth

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(746) 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(471) 评论(0) 推荐(0)

Answer1215

公告