Yesterday I found a little time, to start the annual AOC.
Yes, I know, I am late to the party. But hey: Better late than never.
So, the first part was an easy warm up, just sum
an array. Part 2 was a bit trickier. I came up with this - admittedly - somewhat "not clean" solution.
OTOH, I find it nonetheless readable in one way or the other.
const findDoubleFrequency = array => {
const doubles = new Set();
doubles.add(0);
let acc = 0;
while (
!array.find(x => {
acc += x;
if (doubles.has(acc)) {
return true;
}
doubles.add(acc);
return false;
})
) {}
return acc;
};
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