killroy42

(()=>{
const p20 = (()=>{
const F=[1,1,2,6,24,120,720,5040,40320,362880];
const chrLUT = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_~', encNum = n=>chrLUT[n], decNum = c=>chrLUT.indexOf(c);
const sizeMap = [9,6,6,6,6,6,6,6,6,6,3,3,3], bitMap = [19,10,10,10,10,10,10,10,10,10,3,3,3], reBitMap = new RegExp(bitMap.map(n=>`(.{${n}})`).join(''));
const N9 = [...Array(9).keys()], boxLUT = N9.map(b=>N9.map(n=>(~~(b/3)*27+b*3%9)+~~(n/3)*9+n%3)), rowLUT = N9.map(r=>N9.map(c=>r*9+c)), colLUT = N9.map(c=>N9.map(r=>r*9+c));
const getLc = (perm,s=[...perm.keys()])=>perm.map((n,_,a,i=s.indexOf(n))=>(s.splice(i,1),i));
const fromLc = (code,s=[...code.keys()])=>code.map((i,_,a,e=s[i])=>(s.splice(i, 1),e));
const lcToInt = (lc,l=lc.length)=>lc.reduce((int,n,i)=>int+n*F[l-i-1],0);
const intToLc = (int,z=9)=>[...Array(z)].map((_,i,a,c=F[z-i-1],n=Math.floor(int/c))=>(int%=c,n));

jonathanmorley

See Also:

• HN Post
• Regex Golf Answers (Gist)
• Best known Regex Golf solutions (Gist)
• Regex Golf (reddit)

Normal

Level	Score	Regex	Credit

mbostock

license: gpl-3.0

wintercn

function getCommonParent(el1,el2){

    var parents1 = [];
    var el = el1;
    while(el) {
        parents1.unshift(el);
        el = el.parentNode;
    }

    var parents2 = [];

eligrey

/*
 * object.watch polyfill
 *
 * 2012-04-03
 *
 * By Eli Grey, http://eligrey.com
 * Public Domain.
 * NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
 */