FAQ: Learn Trees: Javascript - Breadth-first Tree Traversal

Frequently Asked Questions JavaScript FAQ
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This community-built FAQ covers the “Breadth-first Tree Traversal” exercise from the lesson “Learn Trees: Javascript”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Pass the Technical Interview with JavaScript

FAQs on the exercise Breadth-first Tree Traversal

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Wouldn’t the const current be better outside of the while loop as a let current?

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Inside a loop, the block is exited after the current iteration and re-entered on each subsequent iteration so is technically a fresh namespace, hence we can use const inside the loop.

 > a = 10
<- 10
 > while (a > 0) {
       const b = a ** 2;
       console.log(b);
       a--;
   }
   100
   81
   64
   49
   36
   25
   16
   9
   4
   1
<- 1
  >

The only reason to use let is if there is reassignment within the loop, and that would be the case for declaring it before the loop.

Bottom line: Don’t be fooled into thinking there is a right way and wrong way, as in black and white thinking. Keep an open mind and don’t be hobbled by unproven notions. That is the only real ‘should’ in programming.