Can Promise load multi urls in order?

get('a.json').then(function(a) {
    return get('b.json');
}).then(function(b){
    return get('c.json');
}).then(function(c) {
    // all done here
}), function(err) {
    // error here
});

async function someFunction() {
    let a = await get('a.json');
    let b = await get('b.json');
    // do something with a and b here
    return something;
}

someFunction().then(result => {
    // all done here
}).catch(err => {
    // error here
});

Promise.all([get('a.json'), get('b.json'), get('c.json')]).then(function(results) {
    // all done with results here
}, function(err) {
    // error here
});

['a.json', 'b.json', 'c.json'].reduce(function(p, item) {
    return p.then(function(){
        // process item here
    });
}, Promise.resolve()).then(function(result) {
    // all done here
}, function(err) {
    // error here
});

Promise.map(['a.json', 'b.json', 'c.json'], function(item) {
    // do some operation on item and return data or a promise
    return something;
}).then(function(results) {
    // all done
}, function(err) {
    // error here
});

function get(url) {
    function pget(u) {
        var p = this.then(function (result) {
            log(result);
            return get(u);
        });
        p.get = pget;
        return p;
    }
    var p = new Promise(function (resolve, reject) {
        setTimeout(function() {
            resolve(url);
        }, 500);
    });
    p.get = pget;
    return p;
}

get('a.json').get('b.json').get('c.json').then(function(result) {
    log(result);
    log("done");
}, function(err) {
    log("err");
});

function log(x) {
    var div = document.createElement("div");
    div.innerHTML = x;
    document.body.appendChild(div);
}

function delay(url) {
    return new Promise(function (resolve, reject) {
        setTimeout(function() {
            log(url);
            resolve(url);
        }, 500);
    });
}

function get(url) {
    
    function pget(u) {
        if (!u) {
            return this.promise;
        } else {
            return {promise: this.promise.then(function() {
                return delay(u);
            }), get: pget}
        }
    }
    
    return {promise: delay(url), get: pget};
}

// note the empty .get() right before the .then()
// the empty .get() at the end is required in this scheme
get('a.json').get('b.json').get('c.json').get().then(function(result) {
    log("done");
}, function(err) {
    log("err");
});


function log(x) {
    var div = document.createElement("div");
    div.innerHTML = x;
    document.body.appendChild(div);
}