Book Image

Mastering The Faster Web with PHP, MySQL, and JavaScript

By : Andrew Caya
Book Image

Mastering The Faster Web with PHP, MySQL, and JavaScript

By: Andrew Caya

Overview of this book

This book will get you started with the latest benchmarking, profiling and monitoring tools for PHP, MySQL and JavaScript using Docker-based technologies. From optimizing PHP 7 code to learning asynchronous programming, from implementing Modern SQL solutions to discovering Functional JavaScript techniques, this book covers all the latest developments in Faster Web technologies. You will not only learn to determine the best optimization strategies, but also how to implement them. Along the way, you will learn how to profile your PHP scripts with Blackfire.io, monitor your Web applications, measure database performance, optimize SQL queries, explore Functional JavaScript, boost Web server performance in general and optimize applications when there is nothing left to optimize by going beyond performance. After reading this book, you will know how to boost the performance of any Web application and make it part of what has come to be known as the Faster Web.
Table of Contents (19 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Foreword
Contributors
Preface
Free Chapter
1
Faster Web – Getting Started
6
Querying a Modern SQL Database Efficiently
Index

The global object and local variables


JavaScript’s global object is the container of all global variables. Any top-level variable of any compilation unit will be stored in the global object. The global object is one of the worst parts of JavaScript when it is not used correctly, as it can easily become bloated with unneeded variables and can be unknowingly abused by developers when JavaScript default behavior is heavily relied upon. Here are two examples of such misuse:

  • When running a simple code such as total = add(3, 4);, you are, in fact, creating a property named total in the global object. This is not a good thing for performance as you might keep a lot of variables on the heap while most of them are only required at a certain moment of an application's execution.
  • When neglecting to use the new keyword in order to create an object, JavaScript will execute an ordinary function call and will bind the this variable to the global object. This is a very bad thing, not only for security reasons...