Reverse whole string while keeping the spaces at the same position

Question

This is the code I have tried. If we input "We are farmers!" it should return "!s rem raferaeW" however the code I have returns "!s remr aferaeW"

function reverseStr(input){

  var array1 = [];  
  var array2 = [];
  var nWord;
  for (var i = 0; i < input.length; i++) {

    array1.push(input[i]);

  }

  var spaces = [];

    for (var i = 0; i < array1.length; i++) {
        if(array1[i] == " ") {
            spaces.push(i);
        }
    }

  console.log(array1);
  console.log(spaces);

  array2 = array1.slice().reverse();

  var spaces2 = [];

  for (var i = 0; i < array1.length; i++) {
        if(array2[i] == " ") {
            spaces2.push(i);
        }
    }

  console.log(spaces2);

  for (var i = spaces2.length - 1; i >=0; i--) {
      array2.splice(spaces2[i], 1);
  }

  console.log(array2);

  nWord = array2.join('');

  console.log(nWord);

  var array3 = [];

  for (var i = 0; i < nWord.length; i++) {
      array3.push(nWord[i]);
  }

  console.log(array3);

  for (var i = spaces.length - 1; i >=0; i = i - 1) {
      array3.splice(spaces[i], 0, " ");
  }

  console.log(array3);

  var anWord = array3.join('');
  return anWord;

}

var input = "We are farmers!";
reverseStr(input);

First I pushed each letter of the input into an array at "array1". Then I made an array for the indexes of the spaces of "array1" called "spaces."

Then "array2" is an array of "array1" reversed.

Then "spaces2" is an array of the indexes for "array2" and then I used a for loop to splice out the spaces in array2. Then "nWord" is "array2" combined to form a new word.

Then "array3" is an array for all of nWord's letters and I used a reverse for loop for try to input spaces into "array3" and using the indexes of the "spaces" array. Unfortunately, it is not returning "!s rem raferaeW" and IS returning "!s remr aferaeW".

I am trying to know how I can use the indexes of the "spaces" array to create spaces in "array3" at indexes 2 and 7.

Answer 1

You just need to make following change

 //for (var i = spaces.length - 1; i >=0; i = i - 1) {
  //    array3.splice(spaces[i], 0, " ");
  //}

  for (var i = 0; i < spaces.length; i = i + 1) {
      array3.splice(spaces[i], 0, " ");
  }

You are reading spaces array in reverse but as the problem stated spaces should be at same place. Reading it from start to finish fixed the issue.

function reverseStr(input){

  var array1 = [];  
  var array2 = [];
  var nWord;
  for (var i = 0; i < input.length; i++) {

    array1.push(input[i]);

  }

  var spaces = [];

    for (var i = 0; i < array1.length; i++) {
        if(array1[i] == " ") {
            spaces.push(i);
        }
    }

  console.log(array1);
  console.log(spaces);

  array2 = array1.slice().reverse();

  var spaces2 = [];

  for (var i = 0; i < array1.length; i++) {
        if(array2[i] == " ") {
            spaces2.push(i);
        }
    }

  console.log(spaces2);

  for (var i = spaces2.length - 1; i >=0; i--) {
      array2.splice(spaces2[i], 1);
  }

  console.log(array2);

  nWord = array2.join('');

  console.log(nWord);

  var array3 = [];

  for (var i = 0; i < nWord.length; i++) {
      array3.push(nWord[i]);
  }

  console.log(array3);

  //for (var i = spaces.length - 1; i >=0; i = i - 1) {
  //    array3.splice(spaces[i], 0, " ");
  //}
  
  for (var i = 0; i < spaces.length; i = i + 1) {
      array3.splice(spaces[i], 0, " ");
  }

  console.log(array3);

  var anWord = array3.join('');
  return anWord;

}

var input = "We are farmers!";
reverseStr(input);