Join a string with an array in Javascript -

I do not understand why this test failed:

  This ('concat string and arr', function (done) {var str = "update userprofile set firstname = 'Barbara', last name = 'jensen', cellphone = '5638499', email = 'me@gmail.com' 'Var' = '[' computer ',' business'] expectation of str + = "interests =" + arr var = "Update userprofile set firstname = 'Barbara', lastname = 'jensen', cellphone = '5638499', email = 'Me@gmail.com', Interests = ['Computer', 'Business'] "(SRR). Uneven (Expected) done ()})  

The test result looks like this:

< / P>

when you do

  "interests =" + arr   
  toString  will override the  object  to the  toString  method, / P> 
 
  array  overrides the object. For the   array  object, the  toString  method joins the array and gives a string in which each array element is separated by commas . For example, the following code creates an array and uses  toString  to convert the array into a string. 
 
  var monthNames = ['Jan', 'Feb', 'march', 'app']; Var myVar = monthNames.toString (); // Assign 'myVar  
 
 
 from January, February, March, April, to fix the case of your trial, you have to manually convert the array, such as (",") That 
 
  str + = "interests = [" MonthNames.map (function (current string) {return "'" + current string "" ";}) + "]";