So far we've been transducing by manually calling .reduce() on arrays, but we want to be able to transduce over other collection types as well. In this lesson we'll create a transduce function to support transducing over any data structure that imple…

We've seen how we can transduce from arrays or other iterables, but plain objects aren't iterable in Javascript. In this lesson we'll modify our transduce() function so that it supports iterating from plain objects as well, treating each key value pa…

A frequent use case when transducing is to apply a transformation to items without changing the type of the collection. In this lesson, we'll create a helper to do just that. seq will be similar to into, except the target type will be inferred from t…

原文链接来源:                       http://www.ruanyifeng.com/blog/2009/08/learning_javascript_closures.html 当嵌套函数在被嵌套函数之外调用的时候,就形成了闭包.  (By nowmagic)         // 函数内部可以直接读取全局变量             var n = 999;             function f1() {                 alert(n);…

Our transduce function is powerful but requires a lot of boilerplate. It would be nice if we had a way to transduce into arrays and objects without having to specify the inner reducer behaviour, i.e. how to build up values, since a given collection t…

上一篇简单描述了一下SequoiaDB的简单CRUD操作,本篇将讲述一下稍微高级点的功能. 部署在我机器上的集群环境,在经过创建名字为"foo"的cs,创建名字为"bar"的cl,以及插入一些数据之后,并没有删除掉,因此在本篇中会继续使用. 首先,我们先看看,在SequoiaDB的安装目录中的database目录里面,有那些文件: ~$ ls /opt/sequoiadb/database/data/11850 我们会发现有几个文件:foo.1.idx,foo.1.…

环境:Qt5.7.0,VS2013 一.简单介绍 从 Qt5.4 开始已经去掉 Qt WebKit 模块了,使用的是 chrome 内核封装的 QtWebEngine,浏览器相关的类有以下几个: QWebEngineCertificateError Information about a certificate error QWebEngineDownloadItem Information about a download QWebEngineFullScreenRequest Enables…

Backbone is becoming wildly popular as a web application development framework. Along with this popularity comes countless extensions and plugins to enhance the power of the framework, and fill in holes that other felt needed filling. Let's take a lo…

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JavaScript Object-based JavaScript is almost entirely object-based. Object name Object property names are string keys. syntax dot notation (obj.x = 10) bracket notation (obj['x'] = 10) value A value can be a string in double quotes, or a number, or t…