Published
Edited
Jan 29, 2020
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md`# Project Euler: Problem 1 with Javascript`
md`Problem 1: If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Find the sum of all the multiples of 3 or 5 below 1000.`
number = 10
md`### Non functional (imperative) solution`
standard = function multiplesOf3and5(number) {
let total = 0;
for (let i = 0; i < number; i++) {
if (i % 3 == 0 || i % 5 == 0) {
total += i;
}
}
return total;
}
standard(number)
md`### Functional (declarative) solution`
functional = function multiplesOf3and5f(number) {
return [...Array(number).keys()] //create array of numbers eg [0,1,2,3,4,5,6,7,8,9,10] if value of variable number is 10
.filter(x => !(x % 3) || !(x % 5)) //create array of plausible numbers - multiples of 3 and 5 [0,3,5
.reduce((acc,cur) => acc + cur);
}
functional(number)
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