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Creational patterns provide object creation mechanisms that increase flexibility and reuse of existing code. Factory method: Provides an interface for 阅读全文
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Just for fun... Given a number (always positive) as a type. Your type should return the number decreased by one. For example: type Zero = MinusOne<1> 阅读全文
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Blog: https://www.geeksforgeeks.org/es6-trampoline-function/ Stackoverflow problem for recursion: const sumBelow = (number, sum = 0) => ( number 0 ? s 阅读全文
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Serverless framework with AWS Link to each sections Table of Content: Part 0: Serverless Project structure Part 1: DynamoDB & ApiGateway Part 2: Event 阅读全文
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Storage Services: S3 Glacier CloudFront Elastic Block Store (EBS) Storage Gateway Snow family Database Overview Block storage: Used on local networks 阅读全文
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S3 Features Prefiees and delimiters For example: the file name in S3 can be: `marking/plans/kpi_2021_1.pdf`. The point is make it looks like a folder 阅读全文
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In our previous code, we have seen this partten for operators: // #region operators const concat = curry((broadcaster, listener) => { let string = ''; 阅读全文
该文被密码保护。 阅读全文
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Generators can yield promises which can work with the "for await of" loop syntax. This lesson shows how all the pieces fit together and explains why t 阅读全文
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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
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Just like the State ADT an Array is also an Applicative Functor. That means we can do the same tricks with liftA2 with Array that we have been doing w 阅读全文
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Use custom Cypress command for reusable assertions We’re duplicating quite a few commands between the registration and login of our user for assertion 阅读全文
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Use Cypress to test user registration Let’s write a test to fill out our registration form. Because we’ll be running this against a live backend, we n 阅读全文
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Despite the fact that Cypress is an application that runs natively on your machine, you can install it and add it as a dependency just like all other 阅读全文
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Ensure Functions are Called Correctly with JavaScript Mocks Often when writing JavaScript tests and mocking dependencies, you’ll want to verify that t 阅读全文
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1. Color Picker (Chrome) You might know how to use color picker in Chrome, recently there is a feature inside color picker which is "Contrast Ratio", 阅读全文
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We'll examine how to unnest function calls, capture assignment, and create a linear data flow with a type we call Box. This is our introduction to wor 阅读全文
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Well, this stuff will be a little bit strange if you deal with it first time. Container Object: Just a wrapper / contianer for values No Method No Nou 阅读全文
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First, what is 'High Order function', basic just a function, inside the function return another fuction. For example: Decorators is a subset of high o 阅读全文
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Somehow it looks like reflect in Java. For example: We define an mothod on the Object, it called defineMethod(). It accepts two arguements, one is met 阅读全文
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The following code has compiler error: fn jazz(years: &[i64]) -> Releases { let eighties: [i64] = &years[0..2]; let nineties: [i64] = &years[2..4]; Re 阅读全文
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Here is a component which doesn't need to use useEffect export function LocalTodos() { const [todos, setTodos] = useState([]) useEffect(() => { const 阅读全文
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The component using useEffect which is not necessary: function TopicEditor({ selectedTopicId }) { const [enteredNote, setEnteredNote] = useState(''); 阅读全文
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struct VecMetadata { first_elem_index: usize, length: usize, capacity: usize } struct SliceMetadata { first_elem_index: usize, length: usize } Slice i 阅读全文
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The following code will have borrowing problem fn print_years(years: Vec<i32>) { for year in years.iter() { println!("Year: {}", year); } } // dealloc 阅读全文
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function freeze(config?: { unless: () => boolean }) { return function(target: any, propertyKey: string) { let value: any; const getter = function () { 阅读全文
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Mutate the Vec: fn vec_loop(mut v: Vec<i32>) -> Vec<i32> { for element in v.iter_mut() { // Fill this up so that each element in the Vec `v` is // mul 阅读全文
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Intro to Array.prototype.with(index, value) const ages = [10, 15, 20, 25]; const newAges = ages.with(1, 16); console.log(newAges); // [10, 16, 20, 25] 阅读全文
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Example 1: trait AppendBar { fn append_bar(self) -> Self; } impl AppendBar for String { fn append_bar(mut self) -> Self { self.push_str("Bar"); return 阅读全文
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Example 1: fn main() { let mut shopping_list: Vec<&str> = Vec::new(); shopping_list.push("milk"); } Example 2: struct Wrapper<T> { value: T, } impl<T> 阅读全文