随笔分类 - Javascript
摘要：What is Arrow Functor? Arrow is a Profunctor that lifts a function of type a -> b and allows for lazy execution of the function. Arrow can be consider
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摘要：Let's we have some prediction functions, for each prediction function has a corresponding tag: So if we have input as: Also we wish our program to the
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摘要：What we are going to do in this post, is to build a random number generator. As you might know that Javascript provides Math.random(), but the problem
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摘要：Implement a job scheduler which takes in a function f and an integer n, and calls f after nmilliseconds
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摘要：The act of currying can be described as taking a multivariate function and turning it into a series of unary functions. Let's see an example: This is
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摘要：This post is similar to previous post. The difference is in this post, we are going to see how to handle both successfuly result and error result by u
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摘要：Let's say we are going to read some files, return the first file which pass the prediction method, this prediction method can be just check whether th
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摘要：/**@abstract * Write your own Math.pow(a int, b int) function * */ function pow (a, b) { let result = 0; let nigate = b = 2) { result = isEven ? pow(a, b / 2) * pow(a, b / 2) : a * pow(...
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摘要：cons(a, b) constructs a pair, and car(pair) and cdr(pair) returns the first and last element of that pair. For example, car(cons(3, 4)) returns 3, and
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摘要：You probably have functions that aren’t equipped to accept a Maybe as an argument. And in most cases, altering functions to accept a specific containe
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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
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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
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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
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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
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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
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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
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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
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摘要：We refactor a standard node callback style workflow into a composed task-based workflow. Original Code: Using Task: Using Async:
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摘要：Let's examine a pointfree way to write these applicative calls. Since we know map is equal to of/ap, we can write generic functions that will ap as ma
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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
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