V8里面所有的数据类型的根父类都是Object,Object派生HeapObject,提供存储基本功能,往下的JSReceiver用于原型查找,再往下的JSObject就是JS里面的Object,Array/Function/Date等继承于JSObject。左边的FixedArray是实际存储数据的地方。推荐看原文《从Chrome源码看JS Object的实现》 在创建一个JSObject之前,会先把读到的Objec...
array 是在 object 的基础上继续封装而实现的，至于 map 和 set，则是在 array 的基础上又继续封装而...
DECL_ACCESSORS(code_cache, FixedArray) // Returns a copy of the map. Object* Copy(); // Returns the property index for name (only valid for FAST MODE). int PropertyIndexFor(String* name); // Returns the next free property index (only valid for FAST MODE). int NextFreePropertyIndex...
Iterate over array elements or object key-value pairs. Returning false from the iterator function stops the iteration. $.each(['a', 'b', 'c'], function(index, item){ console.log('item %d is: %s', index, item) }) var hash = { name: 'zepto.js', size: 'micro' } $.each(hash...
今天上午下雨了,时小时大,雨声很好听~ speak is cheap ~ 一、Iterator Iterator(遍历器)的概念 JS里原有的表示”集合“的数据结构,主要是Array和Object,ES6...Iterator作用 为各种数据结构提供统一的、简便的访问接口使得数据结构的成员按照某种次序排列 ES6创造了新的遍历命令for...of循环,Iterator接口主要供for....
var arr = new Float32Array( [ 1.0, 2.0 ] ); // Create an iterator: var it = arr.entries(); // Iterate over key-value pairs... var v = it.next().value; // returns [ 0, 1.0 ] v = it.next().value; // returns [ 1, 2.0 ] var bool = it.next().done; // returns ...
Map over the given object or array or objects and create an array of values from the given prop. Dot-notation may be used (as a string) to get nested properties.Paramscollection {Array|Object} prop {Function} returns {String}Example
The next section will demonstrate how the template could be written to iterate through an array, as well. Drilling into Hierarchical Data Templates are often used to render a series of items, which can often contain nested and hierarchical data (object graphs).Figure2shows how Js...
, and subscribe to the event stream using the Observer object. The Observable notifies the subscribed Observer instance whenever an event occurs. Because observable sequences are data streams, you can query them using standard query operators implemented by the Observable type. Thus you can filter,...
The next section will demonstrate how the template could be written to iterate through an array, as well. Drilling into Hierarchical Data Templates are often used to render a series of items, which can often contain nested and hierarchical data (object graphs).Figure2shows how JsRender can iter...