What'S wrong with this code? It has to return if

Question

What'S wrong with this code? It has to return if

the number is the power of three in recursion method, but it doesn't

const isPowerOfThree = (num, toCompare = 1) => {
if (toCompare > num) return false
if (toCompare === num) return true

return isPowerOfThree(num, toCompare ** 3)
}

0

05.02.2019

2 ответов

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Banana

If toCompare is initially 1, raising it to a power leaves it at 1 still. That's your bug.

0

05.02.2019

Banana · Accepted Answer

Banana

Your approach is kind of backwards to the normal approach. Normally you just keep trying to divide by 3 evenly until you get to 1, or it doesn't divide evenly and you know it's not a power of 3.

0

05.02.2019

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What'S wrong with this code? It has to return if

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