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ECMAScript is the official name of the language. Learning Speed In this tutorial, the learning speed is your choice. Bubbling and capturing. Event delegation. Browser default actions. Dispatching custom events. UI Events. Mouse events basics. Drag'n'Drop with mouse events. Forms, controls. Form properties and methods. Form submission: Document and resource loading. DOMContentLoaded, load, beforeunload, unload. Resource loading: List of extra topics that are not covered by first two parts of tutorial.
There is no clear hierarchy here, you can access articles in the order you want. Frames and windows. Popups and window methods. Cross-window communication. The clickjacking attack.
Binary data, files. ArrayBuffer, binary arrays. TextDecoder and TextEncoder. Network requests. Download progress. Cross-Origin Requests. Storing data in the browser.
Objects Arrays are good for lists, but for other tasks they can be hard to work with.
Consider our array of cat friends. What if you also wanted to store more than just names?
But sometimes you have a cat in mind, let's say Bill, and you just want to look up that cat's address. With arrays it takes a lot of work because you can't just say 'hey array, give me Bill's address' because 'Bill' is in one array and his address is in a totally different array.
This can be brittle because if our arrays change and we add a new cat to the beginning we would have to also update our billsPosition variable to point to the new location of Bill's information in the arrays!
Because now we have a variable for each cat that we can use to get that cats values in a more convenient and readable way. You can think of Objects like keys on a keyring. Each one is for a specific door and if you have nice labels on your keys you can open doors very fast.
To understand why callbacks are useful you first have to learn about asynchronous often shortened to async programming. Asynchronous code by definition is code written in a way that is not synchronous. Synchronous code is easy to understand and write. Pretty straightforward!
Synchronous code is fine for things that happen fast, but it's horrible for things that require saving, loading, downloading or uploading.
So if you have synchronous code for downloading a photo, and the photo download takes one second, it means you are potentially preventing 8. Some languages have a function called sleep that blocks execution for some number of seconds. For example here is some bash code running in Terminal.
In the non-blocking version you will notice that only a gets invoked, and b is simply passed in to a as an argument. In the blocking version, there is no explicit relationship between a and b.
In the non-blocking version it becomes a's job to do what it needs to do and then call b when it is done. Using functions in this way is called callbacks because your callback function, in this case b, gets called later on when a is all done. In the function definition for a above the done argument is our b function that we pass in. This behavior is something that is hard to wrap your head around at first.
When you call a function, the arguments you pass in won't have the same variable names when they are in the function. In this case what we call b is called done inside the function. But b and done are just variable names that point to the same underlying function. Usually callback functions are labelled something like done or callback to make it clear that they are functions that should be called when the current function is done.
So, as long as a does it's job and called b when it is done, both a and b get called in both the non-blocking and blocking versions.
JS Reference. A few small option changes, slightly more data, for this example and a Line Chart can be rendered successfully.
Sets and ranges [ Set responsive to true so that the chart responds to the screen-width, leaving pixel perfect visualizations across different screen sizes. Greedy and lazy quantifiers.
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