Basic Algorithm Scripting. Reverse a String

Hi everyone,

There is a lesson freecodecamp

I completed it on my own, but when I looked into solutions I’ve found interesting and neat solution:

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

Question: why is RETURN STR at the top, and “actions” are after it… I kinda understand what each of the following lines do but I just don’t understand why the function returns str before splitting, reversing and joining it…

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Hi,

It doesn’t return str before it does those “actions”, it ignores white space, in this instance new line it is same as str.split("").reverse().join("").

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function reverseString(str) {

let temparr=;

let revStr="";

for(let i=0; i<str.length; i++){

temparr[i] = str[str.length-(i+1)];

revStr += temparr[i];

}

return revStr;

}

console.log(reverseString(“hello”));

2 Likes

Basic Solution: Without Using the Built-in Functions
Here we emulated the split method then reverse then at last join for those curious about how they work

function reverseString(str) {
  //declaring variables
  let charsArray = [],
      reversedArray = [],
      stri = "";
  //split method    
  for (let char of str) {
    charsArray.push(char);
  }
  //reverse method
  for (let i = charsArray.length-1; i >= 0; i--) {
    reversedArray.push(charsArray[i]);
  }
  //join method
  reversedArray.forEach(char => stri += char);
  return stri;
}

Hope this can help

4 Likes

Hi @mohammedelgammal!

Thank you for your response.

This topic was already marked with a solution and hasn’t been active for over 7 months.

Please try to respond to newer topics.

Thanks!