Javascriptは一行(文)でクイックソートできる



https://ideone.com/Gh42zB


QS = X=>X.length<=1? X:[
...QS(X.filter((x,i)=>i>0&&x<X[0]))
,X[0],
...QS(X.filter((x,i)=>i>0&&x>=X[0]))];