Javascript Slice Function Question

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I've created a JS function called 'count' that accepts two integer parameters and returns a string containing all numbers between those two parameters. For example, if I called count(0,10) the program will display '0,1,2,3,4,5,6,7,8,9,10,'. However, I am trying to eliminate the comma after the 10 but am having no luck so far.

JavaScript

function count(num1, num2) 
{

  var strCou = '';
 
  for(var input1 = num1; input1 <= num2; input1++)
  {
    strCou += input1 + ", ";

  }
 
 console.log(strCou);
}
count(2,5);

Posted 11-Apr-13 5:08am

dteece1

Updated 11-Apr-13 6:55am

Sandeep Mewara

v2

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enhzflep · Answer 1 · 2013-04-11T09:17:00

Looking your original code, we can see that ", " is appended after each element. That's close, but not quite the way it works when writing a bunch of numbers on paper.

When we hand-write a list, we insert ", " before each element unless it's the first item.

So, an approach involves keeping track of the current element number. We then add ", " before each element except the first one.

JavaScript

function count(num1, num2)
{

  var strCou = '';
  var i = 0;
  for(var input1 = num1; input1 <= num2; input1++)
  {
    if (i != 0)
       strCou += ", ";

    strCou += input1;
    i++;
  }

 console.log(strCou);
}
count(2,5);

Sandeep Mewara · Answer 2 · 2013-04-11T06:58:00

Solution 1

Try:

JavaScript

console.log(strCou.substring(0,strCou.length-1));

Using substring method will just give the needed string. Above, we removed the last character whatever it was.

Posted 11-Apr-13 6:58am

Sandeep Mewara

Anshu Krishna · Answer 3 · 2013-05-21T21:34:00

Solution 3

JavaScript

function count(num1,num2) {
    var a=new Array();
    for(var i=num1;i<=num2;i++)
        a.push(i);
    return a.join(',');
}
console.log(count(0,10));

Posted 21-May-13 21:34pm

Anshu Krishna

Updated 21-May-13 21:36pm

v2

MoistMan202 · Answer 4 · 2023-03-19T21:40:00

Solution 4

This may be helpful to you or for any future readers on how to use the slice function properly JavaScript Substring: A Tale of Slicing and Dicing Strings[^]

Posted 19-Mar-23 21:40pm

MoistMan202

Updated 19-Mar-23 21:59pm

Javascript Slice Function Question

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