executeQueue.js

function executeQueue(...fns)  {
    fns = fns.reverse()
    return fns.reduce(function(next, fn) {
        return fn.bind(this, next)
    }, function() {
        console.log("DONE")
    })
}

/*
function executeQueue(...fns)  {
    let next = function(){ console.log("DONE"); }
    let i = fns.length - 1;
    while(i >= 0) {
        next = fns[i].bind(this, next);
        i -= 1;
    }
    return next
}
*/