Unique Array Values
When you look at any programming language, you see missing features that you find puzzling because the use case seems so common. One such case is retrieving unique values from an array with JavaScript. Years ago I mentioned an easy way of unique value management using objects instead of arrays, but that's not always an option and doesn't match every use case.
Want to retrieve a unique array of values from an array that may include duplicate values? You can use new JavaScript spread operator with Set to get an array of unique values:
var j = [...new Set([1, 2, 3, 3])]
>> [1, 2, 3]
Getting unique array values is another awesome usage of the spread operator. And don't forget you can merge object properties with the spread operator!
There's no better feeling than being able to remove a library to complete a task that should be native to the language. This trick brings us one step closer to that!
![Being a Dev Dad]()
I get asked loads of questions every day but I'm always surprised that they're rarely questions about code or even tech -- many of the questions I get are more about non-dev stuff like what my office is like, what software I use, and oftentimes...
![9 More Mind-Blowing WebGL Demos]()
With Firefox OS, asm.js, and the push for browser performance improvements, canvas and WebGL technologies are opening a world of possibilities. I featured 9 Mind-Blowing Canvas Demos and then took it up a level with 9 Mind-Blowing WebGL Demos, but I want to outdo...
![Create Snook-Style Navigation Using MooTools]()
Jonathan Snook debuted a great tutorial last September detailing how you can use an image and a few jQuery techniques to create a slick mouseover effect. I revisited his article and ported its two most impressive effects to MooTools.
The Images
These are the same...
![9 Incredible CodePen Demos]()
CodePen is a treasure trove of incredible demos harnessing the power of client side languages. The client side is always limited by what browsers provide us but the creativity and cleverness of developers always pushes the boundaries of what we think the front end can do. Thanks to CSS...
If you’re forced to stay in EC5-land without the spread operator, you can use the pollyfillable
Array.from()Doesn’t seem to work for arrays of objects unless I’m missing something.
If your array is an object, you can use map function, to get the value in an array.
then you can run method like above.
Anybody using babel with this one should be cautious, this will result in an array with a single set element. Patrick Denny’s is the most predictable form.
Thanks David! Very helpful! :)