Change the order

JavaScript
1

Tell us what’s happening:
I am using “while” to make a loop, but the result is [0,1,2,3,4,5], where as the question requires [5,4,3,2,1,0]
So how can I change the order of numbers?
Your code so far*


// Setup
var myArray = [];
var i = 0;
// Only change code below this line
while(i<= 5) {
 
 myArray.push(i);

i++;
}
console.log();

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36.

Challenge: Iterate with JavaScript While Loops

Link to the challenge:

2

maybe use unshift …

3

When you type var i = 0; you are telling javascript to create a variable called i and set it to 0 (zero).

Then, inside your while loop, you say i++ each time it loops. So each time it will add 1 to i, and save i with that new value.

It will keep doing this as long as (“while”) i <= 5

So: Starting from zero, i will take on the values: 0, 1, 2, 3, 4, and 5.

The challenge here is to find a way to start from 5, and go backwards!

Let us know if you would like another hint or a better explanation of how the loop works :slight_smile:

Good luck!

1 Like
4

unshift doesn’t work, I’ve tried that.

5

I’ve already tried that, it doesn’t work. I guess there must be a kind of “count down” code that I haven’t learned yet.

6

what have you tried with unshift?

no, you already know everything, it’s just a matter of using the stuff you know in the right way, to count downward instead of upward

7

There is no such thing as count up or count down in programming I’m afraid. It’s just procedure steps that you can control:

STEP 1. CREATE NUMBER
STEP 2. CHECK IF NUMBER SATISFIES CONDITION
STEP 3. PUSH NUMBER TO ARRAY
STEP 4. CHANGE NUMBER
STEP 5. GO TO STEP 2

Now in order to get countdown from 5 to 0, think what would be the number in step 1, condition in step 2 and how are you going to change number in step 4.

8

Screenshot at Jun 11 10-10-14

Works very well.
I cannot believe that this is an exercise that creates confusion, wait for recursion and asynchrony.

Another way of doing things.

Screenshot at Jun 11 10-17-22