- ASYNC JAVASCRIPT AND YOU DONT KNOW JS ASYNC & PERFORMANCE CODE
- ASYNC JAVASCRIPT AND YOU DONT KNOW JS ASYNC & PERFORMANCE SERIES
Please correct me if I am wrong? I am not a programmer myself so this is my interpretation based on what I have learnt here. Buy You Dont Know JS - Async & Performance by Kyle Simpson at Mighty Ape NZ. with Vert.x an approachable experience, without sacrifying correctness and performance. I haven’t read that book… I think I should… People told you asynchronous programming is too hard for you. Well, it is the WHOLE asyncify function that is passed by AJAX to the event loop, not just setTimeout(…): ajax( ".pre-cached-url.", ASYNCIFY( result ) )
Now what happens with the async? Well: the callback function runs, which runs the async with the corresponding arguments which is like running an async function in the first place. The attributes passed to the sync orig_fn are obtained from the orig_fn itself by getting them from this.
It will run when the callback function runs (this is WOW!). So what this means? It means that it is binding to orig_fn a function to ITSELF with the attributes attached, BUT NOT RUN. The bind() method creates a new function that, when called, has its this keyword set to the provided value, with a given sequence of arguments preceding any provided when the new function is called. Specifically, the sync function will run later. The author is using this trick to bind to the sync function the capacity to behave as the passed async function by AJAX. What would pass? orig_fn.APPLY( THIS, ARGUMENTS) Let’s compares with what would happen if the function is captured as asyn. Let’s read well this other interesting part: orig_fn.BIND.APPLY(orig_fn. performance/README.mdyou-dont-know-js-async-performance), Published: Buy Now. Softcover, published in 2014 by OReilly & Assoc. For the sync though, a binding is required because you are likely assigning an attribute/method to a functionality to make it async. Buy You Dont Know JS - Async & Performance by Kyle Simpson from Boffins Books in Perth, Australia.
ASYNC JAVASCRIPT AND YOU DONT KNOW JS ASYNC & PERFORMANCE CODE
I’ll highlight the difference between testing a unit of code which.
In this post I’ll explain why that’s not generally the case. He uses this because the author is considering the current scope of the orig_fn function. There seems to be a common misconception in the JavaScript community that testing asynchronous code requires a different approach than testing ‘regular’ synchronous code. If you are not familiar with the concept of asynchronous programming, you should definitely start with the General asynchronous programming concepts article in this module. The author passes any function into the event loop with its corresponding arguments. Asynchronous JavaScript is a fairly advanced topic, and you are advised to work through JavaScript first steps and JavaScript building blocks modules before attempting this. This function is apparently a callback of a CLOSURE (there are many references about it, you could read perhaps this one too: ).ĮDIT: you can follow also an interesting discussion focused on function SCOPES related to the same book just here in the forum: This page was generated by GitHub Pages.What if you don’t know whether the API in question will always execute async? You could invent a utility like this asyncify(…) proof-of-concept: function asyncify(fn) You-Dont-Know-JS is maintained by KBPsystem777. View on GitHub You Don’t Know JS: Async & Performance Table of Contents No matter how much experience you have with JavaScript, odds are you don’t fully understand the language.
ASYNC JAVASCRIPT AND YOU DONT KNOW JS ASYNC & PERFORMANCE SERIES
You Don’t Know JS: Async & Performance | You-Dont-Know-JS You-Dont-Know-JS A fork of book series on JavaScript.