Wise Fool.
Visioneer.
// Copy of https://observablehq.com/@visnup/day-6-lanternfish#step
stepObject = (fishes) => {
const next = {};
for (const [n, count] of Object.entries(fishes)) { // run through all fish timers
if (n > 0) { //
next[n - 1] = (next[n - 1] || 0) + count;
} else { // n === 0 -> reset to 6 implies incrementing timer 6; idem timer 8
next[6] = (next[6] || 0) + count;
next[8] = (next[8] || 0) + count;
}
}
return next;
}
runnerObject = (data, n) => {
while (n--) data = stepObject(data);
return _.sum(Object.values(data))
}
fishesMap = countBy(data)
countBy = (fishes) => {
const a = new Map();
for (const k of fishes) a.set(k, (a.get(k) || 0) + 1);
return a;
}
stepMap = (fishes) => {
const next = new Map();
for (const [timer, count] of fishes) {
if (timer > 0) {
next.set(timer - 1, (next.get(timer - 1) || 0) + count);
} else {
next.set(6, (next.get(6) || 0) + count);
next.set(8, (next.get(8) || 0) + count);
}
}
return next;
}
runnerMap = (data, n) => {
while (n--) data = stepMap(data);
let sum = 0;
for (let [_, fishes] of data) sum += fishes;
return sum;
}
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