Behavior of this in global and function scope - Also inside IIFE [duplicate]

I saw this code example online and when I run it it logs nothing on the console. I was expecting it to log "User Name" but its logs nothing. why is that so? Why "this" is not pointing to a newly created object? how JS determines the reference of this. What will be the behavior if I change normal function to arrow function and also if I put comple

function createUser() {
      // create an object and return from function
      return {
         name: "User Name", 
         userRef: this,
      };
    }
    // newly create object assigned to user variable 
    var user = createUser();
 
    console.info(user.userRef.name);

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