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joshkautz/digitSum.js

Created September 4, 2016 14:35
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CodeFights - JavaScript code to calculate the sum of all digits in an integer
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digitSum.js
function digitSum(n) {
var sum = 0;
var string = n.toString();
for(i=0; i < string.length; i++){
sum = sum + parseInt(string.substring(i, i+1));
}
return sum;
}
@Slackluky
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You can also just return n%9. I know its not as interesting. But its faster and smaller.

sorry but, if your n = 28, the output will be 1 ( 28%9 = 1 ) instead of 10

@mathiasrw
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You are right. Sorry about that. The n%9 is only if you want to keep adding the digits until you have only one digit left.

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