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The Function

reverseString('')
reverseString(str)

/*
  Takes a string as input and returns it with the characters reversed
*/

reverseString('world');
// "dlrow"

reverseString('JavaScript');
// "tpircSavaJ"

Solution by - Need4Swede

How it works

function reverseString(str){
  
  // Splits the string into an array of characters
  str = str.split("")

  // Reverses the order of the array
  str = str.reverse()

  // Joins the array back into a string
  str = str.join("")

  // Returns the string
  return str

}

Alternatively, you can write it like this...

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

Try it yourself - Codewars Source

You can also use my built-in JavaScript console