Alternate adding a character to the beginning and end of string

Question

I am trying to solve a Javascript puzzle. I need to write a function that uses a while loop to add a character to the beginning of string and then on the next loop adds the character to the end of the string and to the beginning on the loop after that. The function takes two parameters a string and a number of characters to add. So far I have

function padIt(str,n){
  //coding here
    var newStr = "";
    var padding = "*";
    var i = 0;

    while(i<=n){
        if (i%2===0){
          newStr = newStr+padding;
        } else{
          newStr = padding+str;
         }
       i++;
     }
    return newStr;
   }

I am passing the first two test cases but it won't work properly for the third time through the loop. Expecting "* * a *" for n = 3 but only getting "*a". It has to be a while loop so I don't know if I am not setting the loop up correctly or if I am messing up the variables. Any help is greatly appreciated as I am totally lost.

You need to comment/remove your //newStr+=padding; line.

David R
– David R

2016-07-27 17:36:36 +00:00
Commented Jul 27, 2016 at 17:36 — David R
– David R, Commented Jul 27, 2016 at 17:36

Rajaprabhu Aravindasamy · Accepted Answer · 2016-07-27 17:38:17Z

1

You can do it by writing code like below,

function padIt(str,n, pad = "*"){
  var left = Math.ceil(n/2), right = n - left;
  return pad.repeat(left) + str + pad.repeat(right);
}

And this function would print,

console.log("a", 1); // "*a"
console.log("a", 2); // "*a*"
console.log("a", 10); // "*****a*****"

Thing need to be read after implementing this code,

String.prototype.repeat()

answered Jul 27, 2016 at 17:38

Rajaprabhu Aravindasamy

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1 Comment

Sean Cook Over a year ago

Not a while loop but I think this is definitely how I should use the variables.

David R · Accepted Answer · 2016-07-27 17:38:18Z

0

You need to comment your newStr+=padding; line.

Here is the refined code,

function padIt(str,n){
  //coding here
  var newStr = "";
  var padding = "*";
  var i = 0;

  while(i<=n){
    i++;
    newStr=padding+str;
    //newStr+=padding;
}

  return newStr;

}

HTH

answered Jul 27, 2016 at 17:38

David R

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Comments

Shamanchyk · Accepted Answer · 2022-11-02 11:23:24Z

0

function padIt(str,n){
  while(n>0){
    if(n%2 === 0){
      str = str + '*';
    } else{
      str = '*' + str;
    }
    n--;
  }
  return str;
}

answered Nov 2, 2022 at 11:23

Shamanchyk

1

1 Comment

Community Over a year ago

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

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