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Found 2 results

  1. So asynchronous programming is something quite difficult to do in JavaScript, but since we now have Promises and async/await, it's becoming increasingly less complicated. Plus there is no need for "callback hell". So I will assume you understand what Promise.all() is and why it can sometimes be problematic, as it will not wait for all requests to complete and just fails on the first rejected Promise. The following function will still reject on a failed Promise, but the difference being it will wait for all the Promises to complete before resolving or rejecting. If no failure occurred, the
  2. Check if an image actually resolves to a successful HTTP status code e.g. 200 (OK). imageExists returns a promise, so make sure the browser you're using supports promises e.g. Chrome. If not, then you can look at using a polyfill (https://github.com/components/es6-promise) or if you're feeling adventurous, then change the code to use jQuery's deferreds (not recommended). To see it working, copy the code to http://www.es6fiddle.net/ and watch the images either resolve or fail (reject). /*global console, Promise*/ /** * Check if an image is resolvable i.e. returns a HTTP status co
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