Catch array of exceptions

js_catcher.js

var catcher = function() {
    var fns = Array.prototype.slice.call(arguments);
    var onerror = fns[0];
    fns.splice(0, 1); 
    return function() {
        var res = []; 
        var errors = []; 
        for (var i=0; i < fns.length; i++) {
            try {
                res.push(fns[i].apply(this, arguments));
            } catch (e) {
                errors.push(e);
                res.push(null);
            }   
        }   
        if (errors.length > 0) {
            onerror(errors);
        }   
        return res;
    };  
};