Gap in lesson plan

Tell us what’s happening:
Lesson “ES6: Use the Rest Parameter with Function Parameters” had a huge gap in struction. The previous lesson was setting default values for a parameter. In the Rest Parameter lesson, we were expected to know how to use higher-order functions like filter, map and reduce, despite having no exposure to them. Was this intentional?

First-time coder so was very confused.

Your code so far

const sum = (...args) => {
return args.reduce(function(acc, num){
  return acc + num

const sum = (...args) => {
return args.reduce((a, b) => a + b, 0);

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Challenge: Use the Rest Parameter with Function Parameters

Link to the challenge:

These functions are not required to complete the challenge, it can be done with a basic for loop.

1 Like

If that’s the preferred solution, why does the example, hint, and provided solution all use reduce?