In the next few sections, we’ll write two versions of a function called add_time, which calculates the sum of two Time objects. They demonstrate two kinds of functions: pure functions and modifiers. They also demonstrate a development plan I’ll call…
转自:https://gcc.gnu.org/onlinedocs/gcc-4.0.0/gcc/Function-Attributes.html 5.24 Declaring Attributes of Functions In GNU C, you declare certain things about functions called in your program which help the compiler optimize function calls and check your…
16.1 TimeAs another example of a user-defined type, we’ll define a class called Time that records the time of day. The class definition looks like this: class Time(object): """Represents the time of day. attributes: hour, minute, second &qu…
Sometimes it is useful for a function to modify the objects it gets as parameters. In that case, the changes are visible to the caller. increment, which adds a given number of seconds to a Time object, can be written naturally as modifier. def increm…
一.The way of the program problem solving: The process of formulating a problem, finding a solution, and expressing the solution. high-level language: A programming language like Python that is designed to be easy for humans to read and write. low-leve…
We'll learn how to take advantage of Ramda's automatic function currying and data-last argument order to combine a series of pure functions into a left-to-right composition, or pipeline, with Ramda's pipe function. A simple example will take 'teams'…
We have covered the basics of what is Observable.create, and other creation functions. Now lets finally dive into operators, which are the focus of this course. We will see how operators are simple pure functions attached to the Observable type. var…
Single immutable state tree: Should be just one single javascript object. Describing the changes by action: every change in the application state as a plain JavaScript object called “action”. Pure Function & Impure Function: Pure function always retu…
本文主要整理了Immutable.js常用API的使用. Immutable 是什么? 关于Immutable的定义,官方文档是这样说的: Immutable data encourages pure functions (data-in, data-out) and lends itself to much simpler application development and enabling techniques from functional programming such as la…
https://medium.com/@dan_abramov/smart-and-dumb-components-7ca2f9a7c7d0 There’s a simple pattern I find immensely useful when writing React applications. If you’ve been doing React for a while, you have probably already discovered it. This article exp…
C++ Core Guidelines September 9, 2015 Editors: Bjarne Stroustrup Herb Sutter This document is a very early draft. It is inkorrekt, incompleat, and pµøoorly formatted. Had it been an open source (code) project, this would have been release 0.6. Copy…
本文主要整理了Immutable.js常用API的使用. Immutable 是什么? 关于Immutable的定义,官方文档是这样说的: Immutable data encourages pure functions (data-in, data-out) and lends itself to much simpler application development and enabling techniques from functional programming such as la…
redux是什么? redux是一个用于管理js应用状态的容器.redux出现时间并不是很长,在它出现之前也有类似功能的模块出现,诸如flux等等.redux设计的理念很简单,似乎最初这个开发团队就有让redux可以方便融入在server, browser, mobile client端的打算.目前在github上redux-*的第三方中间件.插件越来越多.如果react项目中想使用redux,那么就有react-redux插件来完成配合.而作为开发者,可以使用这些优秀的第三方资源来开发/优化已…
View Functions 函数声明为视图,将无权修改状态 pragma solidity ^0.4.16; contract C { function f(uint a, uint b) public view returns (uint) { return a * (b + 42) + now; } } 以下操作属违规操作 1. Writing to state variables. 2. Emitting events. 3. Creating other contracts. 4. U…
为 web 应用选择 JavaScript 开发框架是一件很费脑筋的事.现如今 Angular 和 React 非常流行,并且最近出现的新贵 VueJS 同样博得了很多人的关注.更重要的是,这只是一些新起之秀. Javascripts in 2017 —— things aren’t easy these days! 那么我们如何选择使用哪个框架呢?列出他们的优劣是极好的.我们将按照先前文章的方式去做,“共有 9 步:为 Web 应用选择一个技术栈”. 在开始之前 —— 是否应用单页 Web 应…
In this lesson, we’ll get the most fundamental understanding of what an automated test is in JavaScript. A test is code that throws an error when the actual result of something does not match the expected output. Tests can get more complicated when y…
