![]() This snippet, which runs just fine in Internet Explorer 8, will not parse in ES6, on the other hand, explicitly forbids re-defining Notably, ES5 makes no special restrictions on variable declarations within the catch block itself. Identifier specified within the parenthesis that follow the catch token. Surrounding lexical environment, and it then inserts a new binding for the The semantics for catch blocks in ECMAScriptĥ are a little tricky. Written out like that, this incompatibility doesn’t seem so bad. Representations inserted into an object literal definition and dynamicallyĮvaluated, branching on the presence of a Synta圎rror? Untold millions of scripts that compare strings by evaluating carefully-escaped Now here is a truly hazardous change! I mean, is it really wise to break the While ES5 explicitly forbids duplicate property names in object The File $(document).ready(function() )" Share some thoughts on what all this means for the web as a platform. I’ll include the source in its entirety then step through piece-by-piece toĬall out the increasingly-broken aspects. Publicizing this information won’t earn me any friends, but I trust that I’m sure there are plenty of people who would rather it go unnoticed. Needless to say, this is the least glamorous aspect of the new language, and Implemented new language features that interfere with its original behavior. Much longer–indeed, many of today’s JavaScript engines have already ![]() ![]() The web site will not function as intended for In 2009 to a pop singer’s fan site, describes a program that is 100% compliant That demonstrates these hazardous changes to the language. Through an extensive survey of JavaScript across the web, I have found a file “People will be so smitten with arrow functionsĪnd block-scope bindings that they won’t care about a few measlyīackwards-breaking changes.” Well I care, and I have evidence that suggests ES6, a.k.a.ĮS2015), the authors identified a number of undesirable side effects of their
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