Add prerequisites for practice exercises

[TomPradat]

Related to #983

[github-actions]

Dear TomPradat

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[TomPradat]

Could i have a hacktoberfest-accepted label on this PR please ? :)

[junedev]

Thanks for picking up this task again. I left some suggestions.

[junedev]

I would add two more here:

Suggested change

	"prerequisites": ["while-loops", "conditionals", "errors"],
	"prerequisites": ["arithmetic-operators", "comparison", "while-loops", "conditionals", "errors"],

[TomPradat]

b8bc2b3

[junedev]

There is no arithmetic operator needed besides + so I would recommend using comparison instead as there are lots of === etc needed. Additionally, the operators && and || are covered in booleans so I would add that.

Suggested change

	"prerequisites": ["numbers", "arithmetic-operators", "classes"],
	"prerequisites": ["numbers", "booleans", "comparison", "classes"],

[TomPradat]

Neat ! I missed the comparison concept too 😕 . And booleans make sense to me too 👍

[TomPradat]

d12bc00

[junedev]

forEach and for...of are taught in the concept array-loops. I would put that one instead of for-loops. The student can still decide to use for loops instead but it makes sense for them to know array loops before working on this exercise. If you disagree it can also stay as is.

Suggested change

	"prerequisites": ["objects", "for-loops", "arrays", "strings"],
	"prerequisites": ["objects", "array-loops", "arrays", "strings"],

[TomPradat]

I missed that concept, I agree 💯

[TomPradat]

2a0aa5d