function permuteT1() {
let permutations = []
for (let i = 0; i < 3; i++) {
permutations.push([i])
}
return permutations;
}
permuteT1()
function permuteT2() {
let permutations = [];
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 3; j++) {
if (i == j) continue;
permutations.push([i, j]);
}
}
return permutations;
}
permuteT2()
function permuteT3() {
const permutations = [];
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 3; j++) {
if (j == i) continue;
for (let k = 0; k < 3; k++) {
if (k == i || k == j) continue;
permutations.push([i, j, k]);
}
}
}
return permutations;
}
permuteT3()
function permute(n, x) {
const permutations = [];
function pick(current) {
if (current.length == x) {
permutations.push(current);
return;
}
for (let i = 0; i < n; i++) {
if (current.includes(i)) continue;
pick([...current, i]);
}
}
pick([]);
return permutations;
}
permute(1,1)
permute(2,2)
permute(3,2)
permute(3,3)
function permuteS(n, x) {
const permutations = [];
let current = new Array(n);
const selection = j => current.slice(0, j);
function pick(j) {
if (j === x) {
permutations.push(selection(x));
return;
}
for (let i = 0; i < n; i++) {
if (selection(j).includes(i)) continue;
current[j] = i;
pick(j+1);
}
}
pick(0);
return permutations;
}
permuteS(3,2)
permuteS(3,3)
function permuteR(n, x) {
const logs = []
let current = new Array(n).fill(-1);
const selection = j => current.slice(0, j);
function pick(j) {
if (j === x) {
logs.push(selection(x));
return;
}
while (current[j] < n - 1) {
current[j]++;
if (selection(j).includes(current[j])) continue;
pick(j+1);
}
current[j] = -1;
}
pick(0)
return logs
}
permuteR(3,2)
permuteR(3,3)
function permuteB(n, x) {
const logs = []
function pick(current) {
if (current.length == x) {
logs.push(current);
return;
}
for (let i = 0; i < n; i++) {
// if (current.includes(i)) continue;
pick([...current, i]);
}
}
pick([]);
return logs
}
permuteB(3,2)
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.