Project Euler, Problem 16: Power Digit Sum

$2^{15} = 32768$ and the sum of its digits is $3 + 2 + 7 + 6 + 8 = 26$ .

What is the sum of the digits of the number $2^{1000}$ ?

Because Javascript has poor precision with large numbers, I used strings.

I wrote a function to double the value of the numbers in my strings and I ran it 1,000 times. Then I wrote a function to sum the numbers in the string produced by that function.

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