tweetablecode.js

// Set random elements on the page to random colors
setInterval(()=>{r=()=>Math.random(),d=document.querySelectorAll('*');d[~~(r()*d.length)].style.background=`hsl(${r()*360},80%,60%)`},10);

// Generate an m x n matrix with elements filled in order
f=(m,n)=>{for(var a=[],i=0;i<m*n;)(a[~~(i/m)]||(a[~~(i/m)]=[]))[~~(i%m)]=++i;return a}

// Maximum value in a multidemnsional array
m=(a)=>{return Math.max(...[].concat(...a))}