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Gabri3l/last_digit.js

Created August 16, 2016 20:41
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last_digit.js
/*
Return the last digit of str1 to the power of str2. They can potentially be two very big values.
*/
function lastDigit(str1, str2){
if (+str2 === 0) return 1;
if (+str1.slice(-1) === 0 && str1.length > 1) return 0;
return Math.pow(+str1.slice(-1), +str2.slice(-2)%4 || 4) % 10;
}
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