Aliases with JavaScript Destructuring
Destructuring in JavaScript has totally changed the way JavaScript is written these days; code is more concise to write but but, from a visual standpoint, the syntax of the language has changed so much. Any good developer knows, however, that change is the constant we live in.
The basic idea behind destructuring in object literals is as follows:
const obj = { x: 1 };
// Grabs obj.x as { x }
const { x } = obj;
There are cases where you want the destructured variable to have a different name than the property name; in that case, you'll use a : newName to specify a name for the variable:
// Grabs obj.x as as { otherName }
const { x: otherName } = obj;
The syntax for specifying an alternate destructured name for an object property is simple and needed. Destructuring had the capability to confuse developers, especially array destructuring and function argument destructuring, but this alias syntax is a simple trick to keep in your locker!
![JavaScript Promise API]()
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...
![Animated 3D Flipping Menu with CSS]()
CSS animations aren't just for basic fades or sliding elements anymore -- CSS animations are capable of much more. I've showed you how you can create an exploding logo (applied with JavaScript, but all animation is CSS), an animated Photo Stack, a sweet...
![Fading Links Using jQuery: dwFadingLinks]()
UPDATE: The jQuery website was down today which caused some issues with my example. I've made everything local and now the example works.
Earlier this week, I posted a MooTools script that faded links to and from a color during the mouseover and mouseout events.
![New MooTools Plugin: ElementFilter]()
My new MooTools plugin, ElementFilter, provides a great way for you to allow users to search through the text of any mix of elements. Simply provide a text input box and ElementFilter does the rest of the work.
The XHTML
I've used a list for this example...
Always have to check your site first to see any updates. Love it david. That’s where good developers stand out. Always adapting to new changes. Just trying to get hang of destructing as i’m not the smartest one in the room.
Hello. I’m using an alias for my destructed object property. How can I handle the property when it’s undefined?
Thanks.
I was looking for something like this. I wonder why the proposal for this feature didn’t follow the syntax of import statements.
Example:
const { x as otherName } = obj;this is the typescript syntax
I don’t know why people call it an “alias”. If it were an alias, changing the variable would change the object property. E.g.
let obj = { x: 1 } let { x: x_notalias } = obj x_notalias = 2 // 2 obj // { x: 1 }I think the only time you can have an alias in JavaScript is with reference types.
let obj = { x: 1 } let obj_alias = obj obj_alias.x = 2 obj // { x: 2 }When destructuring we use the word “alias” to refer to a differently named variable with the same value, rather than a different name that should reference the same variable.