javaScript.argumentsDeepCalc.js

javaScript.argumentsDeepCalc.js

function flexisum(a) {
    var total = 0;
    for (var i = 0; i < arguments.length; i++) {
        var el = arguments[i],
            num;
        if (el == null) {
            continue;
        } else {
            if (isArray(el)) {
                num = flexisum.apply(this, el); //recursion -- deep calculate
            } else if (typeof (el) === 'function') {
                num = Number(el());
            } else {
                num = Number(el);
            }
            if (isNaN(num)) {
                throw Error('cannot convert ' + el + 'to number.');
            }
            total += num;
        }
    }
    return total;

}

var isArray = Function.isArray || function (arr) {
        return typeof arr === 'object' && Object.prototype.toString.call(arr) === '[object Array]';
    };

var tot = flexisum([1, 2, 3], 4, 4, '4', function () {
    return 5;
});
console.log(tot);