learn-co-curriculum / fewpjs_arrow_function_shorthand Goto Github PK

1 const nums = [1,2,3];
2 const squares = nums.map(x => x ** 2); //=> [2,4,6]
3 const doubles = nums.map(x => x * 2); //=> [1,4,9]

So it is displayed in the above way on the learn.co page for the lab - BUT instead of the part to the right of the variable assignment on line two ' //=> [2,4,6]' it needs to be '//=> [1,4,9]'. And vice versa for line 3.

When I run learn command everything works, but when I run submit learn, I get an error Hmm...this doesn't appear to be a Learn lesson. Are you in the right directory?

"we haven't covered iterators quite yet" - yeah you have

on expression is is by analogy.

This lab presents arrow functions as a new concept, but they appear in the four Iterators Drill labs earlier in this section. Also, this lab presents map (and iterators in general) as a concept that hasn't been covered yet.
#staff

At this point, we have been using function expression and arrow functions in several labs. Especially coming for Ruby, it seems like a good idea to move this right to the beginning of the curriculum and tie into the similarities with Ruby by scaffolding the learning.