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One of my favorite things about ES2015 is destructuring + object literals + argument default values.

It makes passing data around a lot easier -> shorter functions -> more maintainable/readable code. E.g.:

getPixels = ({ width = 1280, height = 1024 } = {}) => width * height;

I can call it like so:

getPixels(); // returns 1280*1024

or like so:

const width = 1024, height = 768;
getPixels({ width, height });

or of course:

getPixels({ width: 1024, height: 768 });