Difference between Q all and Q allSettled

Q all vs Q allSettled.js

var Q = require('q'),
    id = 0;

function doWork(timeout, shouldFail) {
    var deferred = Q.defer(),
        _id;

    id += 1;
    _id = id;
    console.log(_id + ' should fail: ' + (shouldFail ? true : false).toString());

    setTimeout(function () {
        console.log(_id + ' did work');
        if (shouldFail === true) {
            deferred.reject('Failed');
        } else {
            deferred.resolve(_id);
        }
    }, timeout);

    return deferred.promise;
}

function functionName(fun) {
    var ret = fun.toString();
    ret = ret.substr('function '.length);
    ret = ret.substr(0, ret.indexOf('('));
    return ret;
}

function run(allSettled) {
    var fn = allSettled ? Q.allSettled : Q.all;

    console.log('Using Q.' + functionName(fn));

    fn([
        doWork(200, false),
        doWork(100, true),
        doWork(300, false),
        doWork(150, true)
    ])
        .then(function (results) {
            console.log('called then');
        })
        .catch(function () {
            console.log('called catch');
        });
}


run(true);