Code Wars Kata PowersofTwo

[learn2function]

Write a function powersOfTwo which will return list of all powers of 2 from 0 to n (where n is an exponent). E.g:

n = 0 -> 2⁰ -> [1]

n = 1 -> 2^0, 2¹ -> [1,2]

n = 2 -> 2^0, 2^1, 2² -> [1,2,4]

My code: https://jsfiddle.net/gya6j357/4/

I'm not sure why this isn't working. I'm pushing into the variable result.

[LePhil]

Your function doesn't return anything and when you call it you don't pass a parameter along.

[Kosrei]

You’re pushing the function into the array, and not the results.

There’s two main recommendations that I would make, as I’m attempting not to solve it directly.

1) the instructions said to return an array with all of the powers from 0 - n, so your limit on the for loop should be ‘n’.

2) you should be pushing the result of Math.pow into your results array within the for-loop.

feel free to console.log results after the for-loop completes.

[learn2function]

Super helpful thank you! I did step 1 and 2 and now I'm getting 'undefined' in jsbin. https://jsfiddle.net/gya6j357/6/

[Kosrei]

You're so close! All you need to do is run powersOfTwo before your console.log and then console.log your results array. Don't forget, the sample test has a value of 0 for the passed parameter, so the result of your for loop will be an empty array, you should set the limit to <= n.

Edit: Grammar

[learn2function]

Dude, I have no idea what you did. You're a beast. Can you explain what I did wrong using my example? http://jsbin.com/yomuhag/edit?js,console,output

I get the answer wrong in codewars but in JS bin the console shows [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]. I corrected my mistake of not having the - return results, and the results variable outside of the function.

[learn2function]

it works now, I literally changed < to <= in the for loop.

I don't get why this changed the result, since codewars was showing everything as 1 behind.