How many hours does this lesson need?

[Fil]

This could be indicated in the introduction.

PS: I'm tempted to start translating this to French :)

[IsaKiko]

Good idea - will add that.
It depends highly on your audience. Just did a class with 60 participants and it took 10 hours to get to the transition bit (without doing any of the challenges at the end).
The frontal teaching goes fast, the exercises take time...

I'd absolutely love to see this translated into French.
The JS and JSON lessons needs some updating though.
Have moved to introducing filters and maps at the same time due to similar syntax and concept and starting with simpler examples.

If you're actually starting on this, let me know, so I can hurry up with those changes.

[Fil]

Last time I did a simple plot with the pokeapi https://pokeapi.co/ , using weights and heights of Pokemons, adapting scales (linear + sqrt), and doing a simple regression (to show the mean body-mass-index). But I think I like your lesson better. (I have to teach next Friday, so whichever I do, I must decide quickly. But don't hurry up things for me, it's already great to have this as it is.)

[Fil]

French translation done
https://github.com/Fil/D3-visualising-data/commits/French