Zhentiw - 博客园

2019年3月5日

[Javascript Crocks] Compose Functions for Reusability with the Maybe Type

摘要： We can dot-chain our way to great success with an instance of Maybe, but there are probably cases where you need to apply the same series of transform 阅读全文

posted @ 2019-03-05 17:15 Zhentiw 阅读(456) 评论(0) 推荐(0)

[Algorithm] Array production problem

摘要： Given an array of integers, return a new array such that each element at index i of the new array is the product of all the numbers in the original ar 阅读全文

posted @ 2019-03-05 02:35 Zhentiw 阅读(161) 评论(0) 推荐(0)

[Algorithm -- Dynamic Programming] Recursive Staircase Problem

摘要： For example there is a staricase N = 3 | | | | | | | | | | There is N = 3 staricase, for each step, you can either take {1 or 2} step at a time. So as 阅读全文

posted @ 2019-03-05 01:36 Zhentiw 阅读(234) 评论(0) 推荐(0)

2019年3月4日

[Transducer] Make Transducer works for Iteratable collection and Object

摘要： We've seen how we can transduce from arrays or other iterables, but plain objects aren't iterable in Javascript. In this lesson we'll modify our trans 阅读全文

posted @ 2019-03-04 20:57 Zhentiw 阅读(302) 评论(0) 推荐(0)

[Algorithm -- Dynamic programming] 91. Decode Ways <How Many Ways to Decode This Message?>

摘要： For example we have 'a' -> 1 'b' -> 2 .. 'z' -> 26 By given "12", we can decode the string to give result "ab" or 'L', 2 ways to decode, your function 阅读全文

posted @ 2019-03-04 01:58 Zhentiw 阅读(352) 评论(0) 推荐(0)

2019年3月1日

[Compose] 21. Apply Natural Transformations in everyday work

摘要： We see three varied examples of where natural transformations come in handy. Let's mark the law here for Natural Transformations: Then let's see why w 阅读全文

posted @ 2019-03-01 22:24 Zhentiw 阅读(319) 评论(0) 推荐(0)

[Compose] 20. Principled type conversions with Natural Transformations

摘要： Natural Transformations, let's explain it by using a coding example, for example, we have a 'Either' holding a value 'a' and we want to transform a' T 阅读全文

posted @ 2019-03-01 21:30 Zhentiw 阅读(300) 评论(0) 推荐(0)

[Compose] 19. Leapfrogging types with Traversable

摘要： We use the traversable instance on List to reimplement Promise.all() type functionality. For example we want to conver: Conver array of Task, into Tas 阅读全文

posted @ 2019-03-01 14:31 Zhentiw 阅读(304) 评论(0) 推荐(0)

2019年2月28日

[Compose] 17. List comprehensions with Applicative Functors

摘要： We annihilate the need for the ol' nested for loop using Applicatives. For example we have this kind of nested loop code: We can refactor it by using 阅读全文

posted @ 2019-02-28 20:53 Zhentiw 阅读(200) 评论(0) 推荐(0)

[Compose] 15. Applicative Functors for multiple arguments

摘要： Working our way backwards from solution to problem, we define an applicative functor, then use it to apply a function of multiple arguments. For examp 阅读全文

posted @ 2019-02-28 19:02 Zhentiw 阅读(247) 评论(0) 推荐(0)

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