Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 16

Python
1

Not stuck on the problem, I’d just like some clarification of how freeCodeCamp’s method for solving this problem works.

I was able to solve the problem using

    x_max = max([x for x,_ in rounded_coords])
    y_max = max([y for _,y in rounded_coords])

but I’d love to understand how the lambda functions that appear as the formal solutions in the following step work.

x_max = max(rounded_coords, key=lambda i: i[0])[0]
y_max = max(rounded_coords, key=lambda j: j[1])[1]

Challenge Information:

Learn Encapsulation by Building a Projectile Trajectory Calculator - Step 16

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2

Hi @a-feltesdeyapp

They both use loops.

Here is an article on lambda functions you may find helpful.

Happy coding

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