javascript - Joining property values of objects in an array -

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I have an array of objects in objects that have a property called userName whether a comma delimited Adding the userName value to the string? I think I can use the join function, but the only way I can think of two steps. 

  var Username: string []; ObjectArr.forEach ((o) => {userNames.push (o.userName);}); Var UsernameJonded = Username.Join (",");   
 Is there a way to do this in a line of code?   
 
 
  map  for  for  And leave brackets and curly braces in the lambda:  
  var user name = object error.map (o = & gt; o.userName). Include (',');

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