What is the process of using a For loop to output a string in reverse order?

Question

What is the process of using a For loop to output a string in reverse order?

I'm attempting to reverse the string "hello" using a For loop, aiming for the output of "olleh". However, I'm facing an issue where the last character in the string is not being removed after being added to the array. Consequently, only the last letter of the string is printed.

What modifications can be made to this code to ensure that the loop eliminates the final character from the string once it has been appended to the array?

function reverseString(str) {
  let holder = [];

  for (let i = str.length; i > 0; i--) {
    holder.push(str.charAt(str.length - 1));
    str.slice(0, -1);
  }

  return holder;
}

console.log(reverseString("hello"));

javascript arrays loops slice

Answer 1

Answer №1

String.prototype.slice()

The slice() method extracts a portion of a string and returns it as a new string, without altering the original string.

Remember to save the returned string back to the variable:

function reverseString(str) {
  let holder = [];
  for (let i = str.length; i > 0; i--){
    holder.push(str.charAt(str.length -1));
    str = str.slice(0, -1); // update the variable
  }
  return holder.join(''); // combine them to return the string
}

console.log(reverseString("hello"));

Alternatively, you can simply split and reverse like this:

function reverseString(str) {
  return str.split('').reverse().join('');
}

console.log(reverseString("hello"));

Answer 2

String.prototype.slice()

The slice() method extracts a portion of a string and returns it as a new string, without altering the original string.

Remember to save the returned string back to the variable:

function reverseString(str) {
  let holder = [];
  for (let i = str.length; i > 0; i--){
    holder.push(str.charAt(str.length -1));
    str = str.slice(0, -1); // update the variable
  }
  return holder.join(''); // combine them to return the string
}

console.log(reverseString("hello"));

Alternatively, you can simply split and reverse like this:

function reverseString(str) {
  return str.split('').reverse().join('');
}

console.log(reverseString("hello"));

Answer 3

Answer №2

It is recommended to use i-1 instead of str.length-1 when traversing through characters in a string. This is because using i will ensure all characters are accessed without the need for the slow slice method.

function reverseString(str) {

  let holder = [];

  for (let i = str.length; i > 0; i--) {
    holder.push(str.charAt(i - 1));

  }

  return holder;
}

console.log(reverseString("hello").join(''));

Answer 4

It is recommended to use i-1 instead of str.length-1 when traversing through characters in a string. This is because using i will ensure all characters are accessed without the need for the slow slice method.

function reverseString(str) {

  let holder = [];

  for (let i = str.length; i > 0; i--) {
    holder.push(str.charAt(i - 1));

  }

  return holder;
}

console.log(reverseString("hello").join(''));

Answer 5

Answer №3

To achieve this task in the most straightforward and concise manner, one can utilize a combination of 3 methods as follows:

function reverseString(str) {
    return str.split("").reverse().join("");
}
console.log(reverseString("hello"));

Answer 6

To achieve this task in the most straightforward and concise manner, one can utilize a combination of 3 methods as follows:

function reverseString(str) {
    return str.split("").reverse().join("");
}
console.log(reverseString("hello"));

Answer 7

Answer №4

Incorporate a for of loop along with the split('') method to easily break down the word and insert each character at the beginning of the array.

let term = 'goodbye';
let container = [];
for(let letter of term.split('')) {
  // Insert at the start of the array
  container.unshift(letter);
}
console.log(container.join(''));

Answer 8

Incorporate a for of loop along with the split('') method to easily break down the word and insert each character at the beginning of the array.

let term = 'goodbye';
let container = [];
for(let letter of term.split('')) {
  // Insert at the start of the array
  container.unshift(letter);
}
console.log(container.join(''));

What is the process of using a For loop to output a string in reverse order?

Answer №1

Answer №2

Answer №3

Answer №4

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