part2 = value(parsed)
function value(p) {
switch (p.type) {
case 0: return d3.reduce(p.packets.map(value), (s, i) => s + i);
case 1: return d3.reduce(p.packets.map(value), (p, i) => p * i);
case 2: return d3.min(p.packets, value);
case 3: return d3.max(p.packets, value);
case 4: return p.value;
case 5: return value(p.packets[0]) > value(p.packets[1]) ? 1n : 0n;
case 6: return value(p.packets[0]) < value(p.packets[1]) ? 1n : 0n;
case 7: return value(p.packets[0]) == value(p.packets[1]) ? 1n : 0n;
default: throw new Error(p.type);
}
}
part1 = d3.sum(versions(parsed))
function* versions(p) {
yield p.version;
for (const s of p.packets || []) yield* versions(s);
}
parsed = packet(test)
function packet(s) {
const b = typeof s === "string" ? bits(s) : s;
const version = takeInt(b, 3);
const type = takeInt(b, 3);
if (type === 4) {
// literal
let value = 0n;
let prefix;
do {
prefix = takeInt(b, 1);
value = (value << 4n) | BigInt(takeInt(b, 4));
} while (prefix);
return { version, type, value };
} else {
// operator
const packets = [];
const lengthType = takeInt(b, 1);
if (lengthType === 0) {
const size = takeInt(b, 15);
const sub = take(b, size);
for (let p; (p = packet(sub)); ) packets.push(p);
return { version, type, packets, lengthType, size };
} else if (lengthType === 1) {
const n = takeInt(b, 11);
for (let i = 0; i < n; i++) packets.push(packet(b));
return { version, type, packets, lengthType, n };
}
}
}
takeInt = (iterable, n) => parseInt([...take(iterable, n)].join(""), 2)
function* take(iterable, n) {
while (n--) yield iterable.next().value;
}
function* bits(string) {
for (const c of string) yield* parseInt(c, 16).toString(2).padStart(4, "0");
}
input = `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`
import { Icicle } from "@d3/icicle"
import { Tree } from "@d3/tree"
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
