arraybuffer

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Let's say I have a sequence of ints like this: val mySeq = Seq(0, 1, 2, 1, 0, -1, 0, 1, 2, 3, 2) I want to split this by let's say 0 as a delimiter to look like this: val mySplitSeq = Seq(Seq(0, 1, 2, 1), Seq(0, -1), Seq(0, 1, 2, 3, 2)) What is the most elegant way to do this in Scala? 回答1: This works alright mySeq.foldLeft(Vector.empty[Vector[Int]]) { case (acc, i) if acc.isEmpty => Vector(Vector(i)) case (acc, 0) => acc :+ Vector(0) case (acc, i) => acc.init :+ (acc.last :+ i) } where 0 (or whatever) is your delimiter. 回答2: Efficient O(n)

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: This Question is related to and inspired by How to updoad in old browsers (ex Safari 5.1.4) Given an element having a files property containing File objects which inherit from Blob , is it possible to create a ArrayBuffer and convert the ArrayBuffer to a data URI from a Blob or File object without using FileReader ? Approaches have tried so far have been create a mock WebSocket with .binaryType set to "arraybuffer" , create a MessageEvent with event.data set to File object; result is File object at onmessage handler set prototype of File to

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am able to send and receive JSON with STOMP over WebSockets following spring documentation . However performance is poor at large high rates, so I wish to profile the use of binary messages. Spring-WebSockets 4.0 JavaScript client running in Chrome 35 stomp.js 1.7.1 Sending I send messages using SimpMessageTemplate with the necessary broker relay - see spring documentation @Controller public class DemoBinaryController { @Autowired private SimpMessagingtemplate template @Scheduled ( fixedDelay = 5000 ) public void demo () throws

What is the preferable way of appending/combining ArrayBuffers? I'm receiving and parsing network packets with a variety of data structures. Incoming messages are read into ArrayBuffers. If a partial packet arrives I need to store it and wait for the next message before re-attempting to parse it. Currently I'm doing something like this: function appendBuffer( buffer1, buffer2 ) { var tmp = new Uint8Array( buffer1.byteLength + buffer2.byteLength ); tmp.set( new Uint8Array( buffer1 ), 0 ); tmp.set( new Uint8Array( buffer2 ), buffer1.byteLength ); return tmp.buffer; } Obviously you can't get

WebSocket 出现前 构建网络应用的过程中，我们经常需要与服务器进行持续的通讯以保持双方信息的同步。通常这种持久通讯在不刷新页面的情况下进行，消耗一定的内存资源常驻后台，并且对于用户不可见。在 WebSocket 出现之前，我们有一下解决方案： 传统轮询(Traditional Polling) setInterval setTimeout setInterval( function ( ) { $.get( "/path/to/server" , function ( data, status ) { console .log(data); }); }, 10000 ); setTimeout function poll ( ) { setTimeout( function ( ) { $.get( "/path/to/server" , function ( data, status ) { console .log(data); // 发起下一次请求 poll(); }); }, 10000 ); } 程序首先设置10秒后发起请求，当数据返回后再隔10秒发起第二次请求，以此类推。这样的话虽然无法保证两次请求之间的时间间隔为固定值，但是可以保证到达数据的顺序。 长轮询(Long Polling) 上面两种传统的轮询方式都存在一个严重缺陷

scala数组：分为定长数组和变长数组 scala> val arr1 = new Array[Int](8) //只定义8个是整型类型的定长数组，没有赋值，每个数组里面的值是0 arr1: Array[Int] = Array(0, 0, 0, 0, 0, 0, 0, 0) scala> val arr1 = new Array[String](8) //只定义8个是字符串类型的定长数组，没有赋值，每个值显示是为null arr1: Array[String] = Array(null, null, null, null, null, null, null, null) scala> println(arr1) //直接打印数组是一个引用，并没有打印出数组里面的内容。 [Ljava.lang.String;@4973f7dd scala> println( arr1.toBuffer ) //使用toBuffer方法将数组里面的内容转换成数组缓冲里面，将其打印出来。 ArrayBuffer(null, null, null, null, null, null, null, null) 下面是直接赋值方式定义一个数组： scala> val arr2 = Array("java","scala","python") //没有用new是调用的一个静态方法 ，并给数组里面每个元素赋值

　　测试数据： 　　 1 E->E+T 2 E->T 3 T->T*F 4 T->F 5 F->(E) 6 F->i 　　代码： 　　无GUI代码（Scala）： 　　 1 import scala.collection.immutable.Stack 2 import scala.collection.mutable 3 import scala.collection.mutable.{ArrayBuffer, Map} 4 import scala.util.matching.Regex 5 6 7 8 9 object LR_1 { 10 private final var allCharacters = new String() 11 private final var relations = new ArrayBuffer[ (String, String, String) ]() 12 private final var VN = new String() 13 private final var VT = new String() 14 private final var rowLength = 0 15 private final var columnLength = 0 16 private final val itemGroup = Map[

I am moving from Node.js to browser environment, and I am still confused over ArrayBuffer vs. typed arrays (such as Uint8Array). I am confused over where to use the typed arrays, and where to use ArrayBuffer directly. It's not hard to convert one to the other and vice versa, but which to use when? For example, when I am creating an object that will represent a chunk of data in my code, should it be ArrayBuffer or Uint8Array? What does it depend on? Or: should I rather return ArrayBuffer from my functions (for example, for external API), or the typed arrays? Note that I can google how exactly

XMLHttpRequest 是一个浏览器接口，使得 Javascript 可以进行 HTTP (S) 通信。 　　最早，微软在 IE 5 引进了这个接口。因为它太有用，其他浏览器也模仿部署了，ajax 操作因此得以诞生。 　　但是，这个接口一直没有标准化，每家浏览器的实现或多或少有点不同。HTML 5 的概念形成后，W3C 开始考虑标准化这个接口。2008年 2 月，就提出了 XMLHttpRequest Level 2 草案。 　　这个 XMLHttpRequest 的新版本，提出了很多有用的新功能，将大大推动互联网革新。本文就对这个新版本进行详细介绍。 　　 一、老版本的 XMLHttpRequest 对象 　　在介绍新版本之前，我们先回顾一下老版本的用法。 　　首先，新建一个 XMLHttpRequest 的实例。 var xhr = new XMLHttpRequest (); 　　然后，向远程主机发出一个 HTTP 请求。 xhr.open ('GET'， 'example.php' ); xhr.send (); 　　接着，就等待远程主机做出回应。这时需要监控 XMLHttpRequest 对象的状态变化，指定回调函数。 xhr.onreadystatechange = function (){ if ( xhr.readyState == 4 && xhr