Shulou(Shulou.com)06/01 Report--

This article mainly shows you "how to use regular expressions for code refactoring and remove redundant code". The content is easy to understand and clear, hoping to help you solve your doubts. Let me lead you to study and learn the article "how to use regular expressions for code refactoring and removing redundant code".

Before refact: a lot of duplicate code

After refact: use map to eliminate duplicate code.

Var usRegx = / XXXX/. is required for each check in the current branch. In fact, a regular expression object is defined literally, which is more expensive than defining a String. In fact, it is not necessary to define map every time, you can define map on a global attribute of controller.

Execute this code to see the performance difference between string constants and regular expression literals:

Var N = 100000000 console.time ("normal string"); for (var I = 0; I < N; iTunes +) {var a = "a";} console.timeEnd ("normal string"); console.time ("regular exp"); for (var I = 0; I < N; iTunes +) {var b = / ^ [0-9] {5} $| ^ [0-9] {5}-[0-9] {4} $/;} console.timeEnd ("regular exp")

The above is all the content of the article "how to use regular expressions for code refactoring and removing redundant code". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.