How To Schedule Timer-Based Callbacks With Example
How To Schedule Timer-Based Callbacks With Example
Introduction
In this article, we will look at how the JavaScript timer functions - settimeout, setinterval, and Cleartimeout -- are used to schedule and cancel timer-based Callbacks, with a simple example of stopwatch program.
Brief of settimeout
- In simple words, it will call any function after the specified time (milliseconds). This specified time is also called a delay.
- For example - if we specify the delay as 5000, then it will wait for 5 seconds and start to execute the function which was passed as a parameter.
Below is the syntax
First Parameter(fn) => Any function name
Second Parameter(delay) => specifies the no. of milliseconds to wait before it starts the execution of given function
... read the whole story at www.c-sharpcorner.com.setImmediate() vs nextTick() vs setTimeout(fn,0) – in depth explanation
setImmediate() vs nextTick() vs setTimeout(fn,0) – in depth explanation
Few days back, I was guiding some new node.js developers on making asynchronous stuffs. We were discussing about async apis of node js. I wanted to provide them with some references and googled for few; but surprisingly, majority of the articles out there in the internet about setImmediate() or process.nextTick() was containing insufficient or misleading information. And going through official documents of Node may not really be feasible for non-advanced developers. Hence I decided to come up with this article.
Know the misconceptions firstBefore I start describing anything, I would like to clear some of the misconceptions of the other articles, covering this topic. If you are not misled yet, you can skip this section.
... read the whole story at voidcanvas.com.Tasks, microtasks, queues and schedules
Tasks, microtasks, queues and schedules
When I told my colleague Matt Gaunt I was thinking of writing a piece on microtask queueing and execution within the browser's event loop, he said "I'll be honest with you Jake, I'm not going to read that". Well, I've written it anyway, so we're all going to sit here and enjoy it, ok?
Take this little bit of JavaScript:
In what order should the logs appear?
Try itClear log Run test
The correct answer: script start
, script end
, promise1
, promise2
, setTimeout
, but it's pretty wild out there in terms of browser support.
Microsoft Edge, Firefox 40, iOS Safari and desktop Safari 8.0.8 log setTimeout
before
Make your Code Cleaner with Decorators
JavaScript — Make your Code Cleaner with Decorators
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When working with JavaScript, you sometimes need to use the setTimeout
function to force some piece of code to run at the next tick. If you are working with Angular, for example, you probably already familiar with this kind of things.
The setTimeout
“hack”:
setTimeout(() => {
...Code...
This Code will run at the next tick.
}, 0);
Call me crazy, but I hate to write code like this, especially when the setTimeout
is not something that comes from my need. I want this to be cleaner. So what if we could abstract the setTimeout
function to a decorator.
Let’s create a method decorator named timeout
to clean our code.
JavaScript Promise API
JavaScript Promises
While synchronous code is easier to follow and debug, async is generally better for performance and flexibility. Why "hold up the show" when you can trigger numerous requests at once and then handle them when each is ready? Promises are becoming a big part of the JavaScript world, with many new APIs being implemented with the promise philosophy. Let's take a look at promises, the API, how it's used!
Promises in the WildThe XMLHttpRequest API is async but does not use the Promises API. There are a few native APIs that now use promises, however:
- Battery API
- fetch API (XHR's replacement)
- ServiceWorker API (post coming soon!)