Perhaps I misunderstood how catching errors with async/await is supposed to work from things articles like this https://jakearchibald.com/2014/es7-async-functions/ and this http://pouchdb.com/2015/03/05/taming-the-async-beast-with-es7.html, but my...
When I'm developing normal web application with JavaScript, the try/catch statement is not needed usually. There's no checked exception, File IO or database connection in JavaScript.   Is try/catch statement useful in JavaScript? When can I u...
I would like to use the window.history.pushState() function in supporting browsers. Unfortunately I'm getting an error on Firefox:     TypeError: history.pushState is not a function   How is it possible to avoid that?...
I'm trying to understand why I'm getting the following error, not how to work around it.  Passing the following code to JSLint or JSHint yields the error 'err' is already defined.  /*jslint white: true, devel: true, onevar: true, brow...
So I am using the JavaScript implementation of Selenium, WebDriverJS. As with any web browser automation the biggest hurdle is getting the code slow down long enough for page elements to load. My solution is this:  for each element I want to interact...
In JavaScript is it wrong to use a try-catch block and ignore the error rather than test many attributes in the block for null?  try{     if(myInfo.person.name == newInfo.person.name       && myInfo.person.address.street == newInfo.person.add...
I'm trying to implement communication with postMessage. There is the main page which opens a popup with an iframe which comes from a different domain. This works fine so far but I want to catch the following error which occurs when I open the iFr...
Consider the following excerpt from ECMA-262 v5.1 (which I recently saw in this question):     A Lexical Environment is a specification type used to define the association of Identifiers to specific variables and functions based upon the lexical nest...
I'm trying to build something on javascript that I can have an input that can be everything like string, xml, javascript and (non-javascript string without quotes)  as follows:  //strings     eval("'hello I am a string'"); /* note...
Is it "slow" to use several try-catch blocks when no exceptions are thrown in any of them? My question is the same as this one, but for JavaScript.  Suppose I have 20 functions which have try-catch blocks in them and another function that cal...

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