gistfile1.js

function arraySum(i) {
    
    // i will be an array, containing integers, strings and/or arrays like itself.
    // Sum all the integers you find, anywhere in the nest of arrays.
    var total = 0;
    
    blah(i)
    function blah(newArray) {
        array = newArray.slice()
        newArray = [];
        if(array.length === 0) {
            return;
        } else {
            array.forEach(function(item) {
                if(item.constructor === Array) {
                    newArray = item.slice()
                } else{sum(item)}
            })
        return blah(newArray) 
        }
    }
    
    function sum(value) {
        if(typeof value === 'number') {
            total += value;
        }
    }

    return total;
}