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This should test your understanding of falsy and truthy numbers in JavaScript 👇

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The 5 most transformative JavaScript features from

JavaScript has come a long way in the past 10 years with brand new feature upgrades in each one.

Let’s look at the 5 most significant features that arrived in ES9; and see the ones you missed.

1. Async generation and iteration

Async generators was a powerful one from ES9.

Just like normal generators but now it pops out the values after asynchronous work like a network request or something:

So when we call .next() we'll get a Promise:

It's such a powerful tool for streaming data in web app in a structured + readable manner — just look at this function that buffers and streams data for a video-sharing app like YouTube:

And now to consume this generator we'll use for await of -- async iteration:

I wonder if the actual YouTube JavaScript code uses generators like this?

2. String.raw

When I use String.raw I'm saying: Just give me what I give you. Don't process anything.

Leave those escape characters alone:

No more escaping backslashes:

We can write:

Perfect for writing regexes with a stupid amount of these backslashes:

Something like this but much worse:

From this✅:

To this ✅:

So "raw" as in unprocessed.

Resolve a promise from outside in JavaScript: practical use cases

It’s one of those “cool” things you can do in JavaScript that are immensely powerful when put to good use.

Powerful practical use cases

Action B waiting for action A

A is ongoing but the user wants to do B but A needs to happen first.

Example: Social app where users can create, save, and publish posts. Like Medium.

What if the user wants to publish the post when it’s saving?

Solution: Ensure the post saves before publishing happens, by resolving promise from outside.

Don’t let the bugs byte,
Tari Ibaba