JavaScript boy and “lovely thoughtleader” 
he/him 
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Relying on object property order for a styling API. Good or bad? eg. styles({ backgroundBlue: true, backgroundRed: true, }); In this case the background would be `red` as it appears last. Relying on property order feels gross but can't think of a better API?
Want to clarify a common misconception that JS does not have a guaranteed property order. It does. In fact it was standardised in ES2015. Before that it was a pseudo-standard among most engines. See https://tc39.github.io/ecma262/#sec-ordinaryownpropertykeys …
Is the key order guaranteed? https://stackoverflow.com/questions/5525795/does-javascript-guarantee-object-property-order …
That SO question is very wrong. JavaScript has guaranteed object property order for years.
I'm hiding some higher abstraction we have. It's more like: styles({default: true, active: isActive}); Where `active` and `default` are a bunch of CSS rules.
JS objects do not guarantee order (arrays do) and should never be treated as an ordered collection. It’s not about if it works or implementation, it’s about the assurances and affordances of the language.
JS has had a guaranteed object property order since ES2015 and before. See https://tc39.github.io/ecma262/#sec-ordinaryownpropertykeys …
might as well go back to regular scss, and learn how to manage it properly / use css-modules / use css-blocks
Thanks for your take but it's unrelated to the question I'm asking. There's a lot more rationale that isn't obvious from this tweet.
Seems like a boolean trap. I'd say it's a pattern to avoid regardless because the behavior can't be inferred by reading the code.
Not sure I understand what you mean? Context: https://fburl.com/4maelwithlove
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