Published
Edited
Jul 23, 2018
12 stars
Also listed in…
Technology
crack = {
if (!target.match(/^[a-z]+$/))
throw new Error("Target string must be just lowercase letters.");
let guessed = "";
for (let char = 0; char < target.length; char++) {
const candidates = letters.map(l => ({
char: l,
str: guessed + l,
padded: (guessed + l).padEnd(target.length, " "),
time: 0
}));
// To make this a bit more accurate, this is a triple-decker loop.
// 40000 iterations of each letter, and 2000 iterations in the letter.
// That way, V8 doesn't slowly optimize as it's comparing the 'a' string
// and then run fast optimized comparisons on the rest of the letters:
// this strategy distributes that warmup cost.
for (let i = 0; i < 40000; i++) {
for (let candidate of candidates) {
let s = performance.now();
// actually deriving a value is not necessary here, but I want to try
// and make sure that v8 doesn't simply optimize away the inner loop.
let equalities = 0;
for (let j = 0; j < 2000; j++) {
if (target == candidate.padded) equalities++;
}
candidate.time += performance.now() - s;
}
if (i % 100 == 0) {
yield html`<pre>
char=${char} i=${i}
Candidates:
${candidates
.sort((a, b) => b.time - a.time)
.map(c => `${c.str}=${c.time.toFixed(1)}`)
.join(", ")}</pre>`;
}
}
guessed += candidates.sort((a, b) => b.time - a.time)[0].char;
}
yield `DONE ${guessed}`;
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.