Intro letter for resume

intro letter for resume

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We could alter our get function to use the json responseType, but we could also solve it in promises land: get en(function(response) return rse(response ).then(function(response) console. response ) Since rse takes a single argument and returns a transformed value, we can make a shortcut: get en(en(function(response) console. response ) see that in action here, check the console in devtools to see the result. In fact, we could make a getjson function really easily: function getjson(url) return get(url).then(rse getjson still returns a promise, one that fetches a url then parses the response as json. Queuing asynchronous actions you can also chain thens to run async actions in sequence. When you return something from a then callback, it's a bit magic.

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Onload function / This is called even on 404 etc / so check the status if (atus 200) / Resolve the promise with dissertation the response text resolve(sponse else / Otherwise reject with the status text / which will hopefully be a meaningful error reject(Error(atusText ;. Onerror function reject(Error Network Error ; / make the request nd now let's use it: get en(function(response) console. response, function(error) ror failed! error ) Click here to see that in action, check the console in devtools to see the result. Now we can make http requests without manually typing xmlhttpRequest, which is great, because the less I have to see the infuriating camel-casing of xmlhttpRequest, the happier my life will. Chaining then isn't the end of the story, you can chain thens together to transform values or run additional async actions one after another. Transforming values you can transform values simply by returning the new value: var promise new Promise(function(resolve, reject) resolve(1 en(function(val) console. Log(val / 1 return val 2; ).then(function(val) console. Log(val / 3 ) As a practical example, let's go back to: get en(function(response) console. response ) The response is json, but we're currently receiving it as plain text.

Complex async code revelation made easier Right, let's code some things. Say we want to: Start a spinner to indicate loading Fetch some json for a story, which gives us the title, and urls for each chapter Add title to the page fetch each chapter Add the story to the page Stop the spinner but also. We'll want to stop the spinner at that point too, else it'll keep on spinning, get dizzy, and crash into some other. Of course, you wouldn't use javascript to deliver a story, serving as html is faster, but this pattern is pretty common when dealing with apis: Multiple data fetches, then do something when it's all done. To start with, let's deal with fetching data from the network: Promisifying xmlhttpRequest Old apis will be updated to use promises, if it's possible in a backwards compatible way. XmlhttpRequest is a prime candidate, but in the mean time let's write a simple function to make a get request: function get(url) / Return a new promise. Return new Promise(function(resolve, reject) / do the usual xhr stuff var req new xmlhttpRequest req. Open get url req.

intro letter for resume

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Ajax returns a deferred. Since it has a then method, solve can turn it into a javascript promise. However, sometimes deferreds pass multiple arguments to their callbacks, for example: var jqDeferred. Json en(function(response, statusText, xhrObj) /., function(xhrObj, textStatus, err) remote /. ) Whereas js promises ignore all but the first: en(function(response) /., function(xhrObj) /. ) Thankfully this is usually what you want, or at least gives you access to what you want. Also, be aware that jQuery doesn't follow the convention of passing Error objects into rejections.

In fact, all new dom apis with async success/failure methods will use promises. This is happening already with" management, font load events, serviceWorker, web midi, streams, and more. Browser support polyfill There are already implementations of promises in browsers today. As of Chrome 32, Opera 19, firefox 29, safari 8 microsoft Edge, promises are enabled by default. To bring browsers that lack a complete promises implementation up to spec compliance, or add promises to other browsers and Node. Js, check out the polyfill (2k gzipped). Compatibility with other libraries The javascript promises api will treat anything with a then method as promise-like (or thenable in promise-speak sigh so if you use a library that returns a q promise, that's fine, it'll play nice with the new javascript promises. Although, as I mentioned, jQuery's Deferreds are a bit unhelpful. Thankfully you can cast them to standard promises, which is worth doing as soon as possible: var jsPromise solve(.ajax whatever.

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intro letter for resume

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Here's how you create a promise: var promise new Promise(function(resolve, reject) / do a thing, possibly async, then if everything turned out fine resolve stuff worked! else reject(Error It broke the promise constructor takes one argument, a callback with two parameters, resolve and reject. Do something within the callback, perhaps async, then call resolve if everything worked, otherwise call reject. Like throw in plain old javascript, it's customary, but not required, to reject with an Error object. The benefit of Error objects is they capture a stack trace, making debugging tools more helpful. Here's how you use that promise: en(function(result) console. Log(result / "Stuff worked!", function(err) console.

Log(err / Error: "It broke" then takes two arguments, a callback for a success case, and another for the failure case. Both are optional, so you can add a callback for the success or failure case only. Javascript promises started out in the dom as "Futures renamed to "Promises and finally moved into javascript. Having them in javascript anxiety rather than the dom is great because they'll be available in non-browser js contexts such as Node. Js (whether they make use of them in their core for apis is another question). Although they're a javascript feature, the dom isn't afraid to use them.

If a promise has succeeded or failed and you later add a success/failure callback, the correct callback will be called, even though the event took place earlier. This is extremely useful for async success/failure, because you're less interested in the exact time something became available, and more interested in reacting to the outcome. Promise terminology domenic Denicola proof read the first draft of this article and graded me "F" for terminology. He put me in detention, forced me to copy out States and Fates 100 times, and wrote a worried letter to my parents. Despite that, i still get a lot of the terminology mixed up, but here are the basics: A promise can be: fulfilled - the action relating to the promise succeeded rejected - the action relating to the promise failed pending - hasn't fulfilled or rejected.


This term reminds me of ex-England football Manager Terry venables so i'll be using it as little as possible. Promises arrive in javascript! Promises have been around for a while in the form of libraries, such as: The above and javascript promises share a common, standardized behaviour called Promises/A. If you're a jQuery user, they have something similar called Deferreds. However, deferreds aren't Promise/A compliant, which makes them subtly different and less useful, so beware. JQuery also has a promise type, but this is just a subset of Deferred and has the same issues. Although promise implementations follow a standardized behaviour, their overall apis differ. Javascript promises are similar in api to rsvp.

Self introduction letter for resume

Unfortunately, in the example above, it's possible that the events happened before we started listening for them, so we need to work around that using the "complete" property of images: var img1 g-1 function loaded / woo yey image loaded if (mplete) loaded else dEventListener. Also, this is loading one image, things get even writings more complex if we want to know when a set of images have loaded. Events aren't always the best way events are great for things that can happen multiple times on the same object—keyup, touchstart etc. With those events you don't really care about what happened before you attached the listener. But when it comes to async success/failure, ideally you want something like this: book / loaded / failed / and whenAllThesehaveloaded(img1, img2).callThis(function / all loaded / one or more failed this is what promises do, but with better naming. If html image elements had a "ready" method that returned a promise, we could do this: en(function / loaded, function / failed / and ady en(function / all loaded, function / one or more failed at their most basic, promises are a bit like event. It cannot succeed or fail twice, neither can it switch from success to failure or vice versa.

intro letter for resume

As a human being, you're multithreaded. You can type with multiple fingers, you can drive and alankit hold a conversation at the same time. The only blocking function we have to deal with is sneezing, where all current activity must be suspended for the duration of the sneeze. That's pretty annoying, especially when you're driving and trying to hold a conversation. You don't want to write code that's sneezy. You've probably used events and callbacks to get around this. Here are events: var img1 g-1 dEventListener load function / woo yey image loaded dEventListener error function / argh everything's broken this isn't sneezy at all. We get the image, add a couple of listeners, then. Javascript can stop executing until one of those listeners is called.

you scoff at those who are jumping up and down like it's news to them. Take a moment to bask in your own superiority, then head straight to the. Javascript is single threaded, meaning that two bits of script cannot run at the same time; they have to run one after another. In browsers, javascript shares a thread with a load of other stuff that differs from browser to browser. But typically javascript is in the same queue as painting, updating styles, and handling user actions (such as highlighting text and interacting with form controls). Activity in one of these things delays the others.

Fireworks explode, glittery paper rains from above, the guaranteed crowd goes wild. At this point you fall into one of these categories: people are cheering around you, but you're not sure what all the fuss is about. Maybe you're not even sure what a "promise". You'd shrug, but the weight of glittery paper is weighing down on your shoulders. If so, don't worry about it, it took me ages to work out why i should care about this stuff. You probably want to begin at the beginning. You punch the air!

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LandAjob provides a large database of potential job opportunities revelation that can be searched and filtered by location, job titles, job skills, federal and non-Federal contractors. Also, working candidates can take part in reimbursements up to 10,000 for work related expenses over a three year period for those on ssdi and five years for those on ssi. Nti@Home places Americans with disabilities in work-at-home jobs. Most of these positions are in the customer Service field, but other work from home positions have included tech support and quality assurance. Nti@Home provides free virtual classes through nti university to prepare candidates for our work-at-home jobs. Click to go to landAjob, click to go to nti@home, home. About nti, contact, copyright 2017, nTI. Developers, prepare yourself for a pivotal moment in the history of web development. Drumroll begins, promises have arrived natively in javascript!


Intro letter for resume
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Jan 03, 2018 promises simplify deferred and asynchronous computations. A promise represents an operation that hasn't completed yet.

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