pairs using recursion

const a = ['A','B','C','D','E'];
function split(a,p)
{
    
    if(a.length==0) return; 
    else {
    let a1 = a[0];
    let b = a[1];
    a.splice(0,2);
    p.push([a1,b]);
    console.log(a,p)
    split(a,p);
    return p;
    }
    
}

console.log(split(a,[]));