onFulfilled not called immediately after promise promise resolved












0














I came across a behaviour of node.js that keep me awake at night.

I can't isolate the issue and it does not happen always.

I dont know what I can trust anymore. Please help.

This is what happen, I have :



    console.log("foo");



    Promise.resolve().then(()=> console.log("bar"));


When the code run I have a long delay ( several seconds ) between foo and bar be printed on the console.

If I put a phony setTimeout(()=>{},0) before the console.log("foo") it solve the issue 😲.



Any hint on what could possibly be happening ?






node.js promise event-loop







share|improve this question



























    0














    I came across a behaviour of node.js that keep me awake at night.

    I can't isolate the issue and it does not happen always.

    I dont know what I can trust anymore. Please help.

    This is what happen, I have :



        console.log("foo");
    

    
    Promise.resolve().then(()=> console.log("bar"));


    When the code run I have a long delay ( several seconds ) between foo and bar be printed on the console.

    If I put a phony setTimeout(()=>{},0) before the console.log("foo") it solve the issue 😲.



    Any hint on what could possibly be happening ?






    node.js promise event-loop







    share|improve this question

























      0












      0








      0







      I came across a behaviour of node.js that keep me awake at night.

      I can't isolate the issue and it does not happen always.

      I dont know what I can trust anymore. Please help.

      This is what happen, I have :



          console.log("foo");
      

      
    Promise.resolve().then(()=> console.log("bar"));


      When the code run I have a long delay ( several seconds ) between foo and bar be printed on the console.

      If I put a phony setTimeout(()=>{},0) before the console.log("foo") it solve the issue 😲.



      Any hint on what could possibly be happening ?






      node.js promise event-loop







      share|improve this question













      I came across a behaviour of node.js that keep me awake at night.

      I can't isolate the issue and it does not happen always.

      I dont know what I can trust anymore. Please help.

      This is what happen, I have :



          console.log("foo");
      

      
    Promise.resolve().then(()=> console.log("bar"));


      When the code run I have a long delay ( several seconds ) between foo and bar be printed on the console.

      If I put a phony setTimeout(()=>{},0) before the console.log("foo") it solve the issue 😲.



      Any hint on what could possibly be happening ?






      node.js promise event-loop




      node.js promise event-loop






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 15 '18 at 17:01









      Joseph GarroneJoseph Garrone

      531513




      531513
























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