var queue = []; queue.push(1); queue.push("A"); queue.push(2); queue.push(3); function processQueue(){ if( queue && queue.length ){ new Promise(function(resolve, reject){ var job = queue.pop(); setTimeout( function(){ if( typeof job === "number" ){ console.log( new Date(), " Processed : ", job ); resolve(); } else { reject(); } }, 1000 ); }).then(processQueue, function(){queue.length=0}); } } processQueue();