![]() I’m the founder and principal at EightShapes. My name is Nathan Curtis and I’ll be moderating today’s panel and the Q&A that follows about a half hour in. Nathan Curtis: Hello and welcome, everyone, to the third A List Apart: On Air event. const tostring = designer at Ushahidi speaker at BDConf and Responsive Field Day Transcript having them cluttering up your output-by adding a handler for the unhandledrejection event, like this: window.addeventlistener("unhandledrejection", event => with the preceding code in place, any time thedog is used in a string context, javascript automatically calls the dogtostring() function, which returns the following string: "dog gabby is a female chocolate lab" using tostring() to detect object class tostring() can be used with every object and (by default) allows you to get its class. Guarantees unlike old-fashioned passed-in callbacks, a promise comes with some guarantees: callbacks will never be called before the completion of the current run of the javascript event loop. ![]() Web › JavaScript › Guide › Using promises creates a xpconnect javascript wrapper for a dom object), xpconnect will call the scriptable helper method nsdomclassinfo::postcreate() which will make sure the prototype chain of the wrapper jsobject is properly set up. to_ | htmlelement.prototype | |._proto_ | element.prototype | |._proto_ | node.prototype | |._proto_ | object.prototype | |._proto_ | null if you have an instance of a htmldivelement in javascript, the following will hold true: div._proto_ = htmldivelement.prototype which means that the following should also be true: div._proto_ = non standard no browser is required to provide modifiable _proto_, nor a global node, nor provide any way to get at host objects nor their associated prototypes. var obj = document.images here, obj will not really have any properties (except for the standard jsobject properties such as constructor, and the non-standard _parent_, _proto_, etc.), all the dom functionality of obj comes from obj's prototype (obj._proto_) that xpconnect sets up when exposing the first image in document to javascript. Prototype setup on an xpconnect wrapped dom node in mozilla when a dom node is accessed from javascript in mozilla, the native c++ dom node is wrapped using xpconnect and the wrapper is exposed to javascript as the javascript representation of the dom node. Mozilla › JavaScript-DOM Prototypes in Mozilla es creating objects defining methods getter and setter details of the object model prototype-based oop creating object hierarchies inheritance promises guarantees chaining error propagation composition timing iterators and generators iterators iterables generators meta programming proxy handlers and traps revocable proxy reflect javascript modules exporting importing default exports renaming features aggregating modules dynamic module loading next ». chapters this guide is divided into several chapters: introduction about this guide about javascript javascript and java ecmascript tools hello world grammar and types basic syntax & comments declarations variable scope variable hoisting data structures and types literals control flow and error handling if.else switch try/catch/throw error objects loops and iteration for while do.while break/continue for.in for.of functions defining functions calling functions function scope closures arguments & parameters arrow functions expressions and operators assignment & comparisons arithmetic operators bitwise & logical operators conditional (ternary) operator numbers and dates number l. ![]() ![]() if you need exhaustive information about a language feature, have a look at the javascript reference. The javascript guide shows you how to use javascript and gives an overview of the language. ![]()
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