gistfile1.txt

Promise.resolve()
    .then(a("OK1"))
    .then(a("OK2"))
    .then(a("OK3"))
    .then(a("OK4"))
    .then(a("OK5"))
    .then(a("DONE"))
    .catch(function(e) {
        console.log("ERROR");
    });


function a(i) {
    return new Promise(function(resolve, reject) {
        setTimeout(function() {
            if (i == "OK4") {
                //console.log("THROW");
                throw ('Error'); 
                reject();
                return;
            }
            if (i == "OK2") {
                reject();
                return;
            }
            console.log(i);
            resolve();
            
        }, 1000);
    });




}