JSFiddle - React, Tailwind, and code Playground

JavaScript

function myfunction(sum){
    var accum = function(val) {
        sum += val;
        
        return accum;
    };
    
    accum.valueOf = function() {
        return sum;
    };
    
    return accum(0);
};

var total = myfunction(1)(2)(3)(4);

console.log(total);