JavaScript data types and data structures Programming languages all have built-in data structures, but these often differ from one language to another. This article attempts to list the built-in data structures available in JavaScript and what proper…

JavaScript & Error Types JavaScript提供了8个错误对象,这些错误对象会根据错误类型在try / catch表达式中引发: Error EvalError RangeError ReferenceError SyntaxError TypeError URIError Error message name EvalError eval() RangeError RangeError: argument is not a valid code point Range…

Types have a bad reputation for making code harder to read, adding unnecessary ceremony, and in general complicating things. In this blog post I’d like to show that a type system done right can help make code more readable and toolable without constr…

Learn how Immutable.js data structures are different from native iterable Javascript data types and why they provide an excellent foundation on which to build your application's state. Instead of them being mutable, they're always immutable, meaning…

本章节介绍如何掌握Javascript里的数字和日期类型 数字EDIT 在 JavaScript 里面,数字都是双精度浮点类型的 double-precision 64-bit binary format IEEE 754 (也就是说一个数字只能在 -(253 -1) 和 253 -1之间).没有特定的数据类型为整型.除了能够表示浮点数,号码类型有三个符号值: +Infinity.-Infinity和 NaN (not-a-number).参见Javascript指南中的 JavaScript…

英文原文 https://scotch.io/tutorials/javascript-transpilers-what-they-are-why-we-need-them 摘译(文章内的代码有些过期,部分改动): Transpilers, or source-to-source compilers,读取用一个编程语言写的源代码,然后产生相等的另一个语言. 你写的语言被翻译成JavaScript,被称为compile-to-JS语言. 你可能听说过CoffeeScript或者TypeScrip这…

原文链接:A re-introduction to JavaScript (JS tutorial) Why a re-introduction? Because JavaScript is notorious for being the world's most misunderstood programming language. It is often derided as being a toy, but beneath its layer of deceptive simplicity…

1. demo 如果你对下面的代码没有任何疑问就能自信的回答出输出的内容,那么本篇文章就不值得你浪费时间了. var var1 = 1 var var2 = true var var3 = [1,2,3] var var4 = var3 function test (var1, var3) { var1 = 'changed' var3[0] = 'changed' var3 = 'changed' } test(var1, var3) console.log(var1, var2, var3,…

A re-introduction to JavaScript (JS Tutorial) Redirected from https://developer.mozilla.org/en-US/docs/JavaScript/A_re-introduction_to_JavaScript IN THIS ARTICLE Introduction Overview Numbers Strings Other types Variables Operators Control structures…

使用TypeScript或者ES2015+标准中的extends关键字是很容易实现继承的,但这不是本文的重点.JS使用了基于原型(prototype-based)的继承方式,extends只是语法糖,本文重点在于不使用extends来自己实现继承,以进一步理解JS中的继承,实际工作中肯定还是要优先考虑使用extends关键字的. 原型 & 原型链 原型用于对象属性的查找.画出下面代码中的原型链图示: class Person { private _name: string; ​ construc…