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Which language is used in the code boxes here? is this a JavaScript extension?

The answer is probably in here https://observablehq.com/documentation/cells/observable-java... but i still don't see why you can do `x = { let y = 5; return y }`

> Named cells look like, and function almost like, assignment expressions in vanilla JavaScript

> But sometimes you want statements, such as for loops. For that you'll need curly braces, and a return statement to give the cell a value. Think of a cell as a function, except the function has no arguments

So `x = { let y = 5; return y }` declares named cell x with value from the return value of that function-like code block. So basically that should be same as `x = 5`, which also is named cell declaration and not JS variable assignment.

I think that's a combination of two features, named cells[1] and blocks[2].

[1] https://observablehq.com/documentation/cells/javascript#nami...

[2] https://observablehq.com/documentation/cells/javascript#expr...

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