Javascript join() array

Question

This might be very simple but I am trying to use the join() array in order to remove the - from the last item on the days array.

How can I do that? This is my code:

var days = [
  'Monday',
  'Tuesday',
  'Wednesday',
  'Thursday',
  'Friday',
  'Saturday',
  'Sunday'
];

var counter = 0;
while (counter < days.length) {
  document.write(days[counter]);
  counter++;
  days.join(' - ');
}

The .join() function returns a string. You just need document.write(days.join(",")); and no loop. — Pointy
– Pointy, Commented Sep 27, 2015 at 15:39
The default join character is comma (,) so just days.join(). — RobG
– RobG, Commented Sep 27, 2015 at 15:40
I do not understand what the question is or what problem you're having. You call days.join() in the loop, but do nothing with the returned string so it is a pointless line of code. Further, your question text refers to removing a -, but there is no such character in your code at all. — jfriend00
– jfriend00, Commented Sep 27, 2015 at 15:42

Marcos Pérez Gude · Accepted Answer · 2015-09-27 15:49:06Z

5

You don't need a loop. It's very simple:

    var days = [
      'Monday',
      'Tuesday',
      'Wednesday',
      'Thursday',
      'Friday',
      'Saturday',
      'Sunday'
    ];

    document.write(days.join(", "));

I don't recommend the use of document.write. It's dangerous. Use DOM methods instead:

document.getElementById("layer").innerHTML = days.join(", ");

And the HTML as simple as this:

<div id="layer"></div>

edited Sep 27, 2015 at 15:49

answered Sep 27, 2015 at 15:42

Marcos Pérez Gude

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6 Comments

jfriend00 Over a year ago

I don't know if this is the correct guess for what the OP is attempting to ask about (question is very unclear), but if so, why don't you put your code into a working snippet?

Marcos Pérez Gude Over a year ago

It's the simplest code that appears in the whole life of stackoverflow hahaha, so if you are exigent, I going to edit with a snippet, don't worry.

jfriend00 Over a year ago

Just a suggestion for how to make your answer better. I guess you don't appreciate such suggestions.

brunodd Over a year ago

@Marcos thank you. So in this case the join() also works as a loop? And yes I know it's not recommended using document.write bla bla bla.. however this is just a test that I am writing.

Marcos Pérez Gude Over a year ago

Yes, join iterates all the array and makes an string with the pattern you define, in this example a comma and an space.

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