The basic functional cornerstones of Scala: immutable data types, passing of functions as parameters and pattern matching. 1. Basic Pattern Matching In Scala, your cases can include types, wildcards, sequences, regular expressions, and so forth. scal…

Symbols of String Pattern Matching in Introduction to Algorithms. As it's important to be clear when discussing the problem of string matching, we can use the meticulous symbols used in Introduction to Algorithms. Text: $T[1, ..., n]$. Pattern: $P[1,…

scala语言的一大重要特性之一就是模式匹配.在我看来,这个怎么看都很像java语言中的switch语句,但是,这个仅仅只是像(因为有case关键字),他们毕竟是不同的东西,switch在java中,只能是用在函数体类的,且需要结合break使用.但是,在scala语言中,pattern matching除了有case关键字,其他,似乎和java又有很多甚至完全不同的东西. scala在消息处理中为模式匹配提供了强大的支持! 下面看看模式匹配的英文定义: A pattern match incl…

Two dimensional pattern matching. Details may be added later.... Corresponding more work can be found in Pattern Matching and Text Compression Algorithm, Maxime Crochemore, Thierry Lecroq. Let's enjoy the code first: #define REHASH(a, b, h) (((h - a…

Pattern matching in functional programming languages is a way to break up expressions into individual cases. We are going to go through how to pattern match in PureScript with simple patterns, guards, array patterns and record patterns. greater :: In…

Scala中的match, 比起以往使用的switch-case有著更強大的功能, 1. 傳統方法 def toYesOrNo(choice: Int): String = choice match { case 1 => "yes" case 0 => "no" case _ => "error" } // toYesOrNo(1)=>"yes" // toYesOrNo(0)=>"n…

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/is 原来的版本 private static string DateTimeFormat(DateTime date) { string result = string.Empty; if (Logger == null) { return result; } var appenders = GetAppenders(); var appende…

一:背景 1. 讲故事 上一篇跟大家聊到了Target-typed new 和 Lambda discard parameters,看博客园和公号里的阅读量都达到了新高,甚是欣慰,不管大家对新特性是多头还是空头,起码还是对它抱有一种极为关注的态度,所以我的这个系列还得跟,那就继续开撸吧,今天继续带来两个新特性,更多新特性列表,请大家关注:新特性预览 二:新特性研究 1. Native ints 从字面上看貌似是什么原生类型ints,有点莫名其妙,还是看一看Issues上举得例子吧: Summar…

模式匹配在F#是非常普遍的,用来对某个值进行分支匹配或流程控制. 模式匹配的基本用法 模式匹配通过match...with表达式来完成,一个完整的模式表达式长下面的样子: match [something] with | pattern1 -> expression1 | pattern2 -> expression2 | pattern3 -> expression3 当你第一次使用模式匹配,你可以认为他就是命令式语言中的switch...case或者说是if...else if...…

The function used here is from the leetcode. Details can be found in leetcode problem: Implement strStr() The best explanation should be made in the comments, which can be understood by the leading of code. // next[j]: the smallest valid position we…