difference.js #1

var unique = require('./unique');
var filter = require('./filter');
var some = require('./some');
var contains = require('./contains');
var slice = require('./slice');


    /**
     * Return a new Array with elements that aren't present in the other Arrays.
     */
    function difference(arr) {
        var arrs = slice(arguments, 1),
            result = filter(unique(arr), function(needle){
                return !some(arrs, function(haystack){
                    return contains(haystack, needle);
                });
            });
        return result;
    }

    module.exports = difference;