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JavaScript

JavaScript runs natively in the browser. Top-level await is supported.

JavaScript runs directly in your browser — no WebAssembly runtime to download. Each block is evaluated inside its own AsyncFunction scope, so let/const declarations don't leak across blocks.

Hello, world

JsBlock-2bafJavaScript ES2023+

Top-level await

User code is wrapped in an async function, so you can await promises directly at the top level.

JsBlock-85e9JavaScript ES2023+

Working with arrays

JsBlock-a4b0JavaScript ES2023+

R

Run R in the browser via WebR. Data frames render as tables, plots render as inline images.

TypeScript

TypeScript transpiled to JavaScript on the fly and executed in your browser.

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Hello, worldTop-level awaitWorking with arrays