Variable hoisting Another unusual thing about variables in JavaScript is that you can refer to a variable declared later, without getting an exception. This concept is known as hoisting; variables in JavaScript are in a sense "hoisted" or lifted…

Ref: 深入理解js的变量提升和函数提升 一.变量提升 简直就是es5的遗毒! console.log(global); // undefined 竟然能打印?因为变量提升,下一行就有定义 var global = 'global'; console.log(global); // global function fn () { console.log(a); // undefined 竟然能打印?因为变量提升,下一行就有定义 var a = 'aaa'; console.log(a); //…

Scala collection such as List or Sequence or even an Array to variable argument function using the syntax :_ *. code : def printReport(names: String*) { println(s"""Donut Report = ${names.mkString(" - ")}""") } prin…

目录 CMake语法-普通变量与函数(Normal Variable And Function) 1 CMake普通变量与函数示例 1.1 CMakeLists.txt 1.2 执行CMake配置脚本 1.3 目录结构 2 运行结果 2.1 环境说明 2.2 运行结果 2.3 结论 2.3.1 定义普通变量方式 2.3.2 variable:表示普通变量名称: 2.3.3 value:表示变量的值列表,value后面有三个点,表示变量的值可以为0或1或n个值 2.3.4 PARENT_SCOPE…

摘要: 本文是吴恩达 (Andrew Ng)老师<机器学习>课程,第二章<单变量线性回归>中第7课时<代价函数>的视频原文字幕.为本人在视频学习过程中逐字逐句记录下来以便日后查阅使用.现分享给大家.如有错误,欢迎大家批评指正,在此表示诚挚地感谢!同时希望对大家的学习能有所帮助. In this video (article), we'll define something called the cost function. This will let us figure…

摘要: 本文是吴恩达 (Andrew Ng)老师<机器学习>课程,第二章<单变量线性回归>中第8课时<代价函数的直观认识 - 1>的视频原文字幕.为本人在视频学习过程中逐字逐句记录下来以便日后查阅使用.现分享给大家.如有错误,欢迎大家批评指正,在此表示诚挚地感谢!同时希望对大家的学习能有所帮助. In the previous video (article), we gave the mathematical definition of the cost functio…

The open source, cross platform, free C++ IDE. Code::Blocks is a free C++ IDE built to meet the most demanding needs of its users. It is designed to be very extensible and fully configurable. Finally, an IDE with all the features you need, having a c…

将感悟心得记于此,重启程序员模式. js, py, c++, java, php 融汇之全栈系列 [Full-stack] 快速上手开发 - React [Full-stack] 状态管理技巧 - Redux [Full-stack] 网页布局艺术 - Less [Full-stack] 异步即时通信 - Async [Full-stack] 跨平台大框架 - RN [Full-stack] 世上最好语言 - PHP 贯通之语言比对 /* 这部分有点全栈系列的味道,日后进阶 */ 语言与框架 语…

Ref: Javascript 严格模式详解 使得Javascript在更严格的条件下运行: - 消除Javascript语法的一些不合理.不严谨之处,减少一些怪异行为; - 消除代码运行的一些不安全之处,保证代码运行的安全: - 提高编译器效率,增加运行速度: - 为未来新版本的Javascript做好铺垫. (1) 需要在有效运行代码的第一行. <script> "use strict"; console.log("这是严格模式."); </s…

JavaScript引擎在预编译时,会将声明(函数声明.变量声明)自动提升至函数或全局代码的顶部.但是赋值不会提升. Because variable declarations (and declarations in general) are processed before any code is executed, declaring a variable anywhere in the code is equivalent to declaring it at the top. This…