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use recursion to reverse a string in javascript

Claire Happel answered on May 17, 2023 Popularity 9/10 Helpfulness 2/10

answer use recursion to reverse a string in javascript

use recursion to reverse a string in javascript

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//pre ES6 (scroll further down for full pseudocode):
var reverseString = function(string) {
  if (string.length === 0) {
   return '';
  }
  return string[string.length - 1] + reverseString(string.slice(0, -1));
};

//post ES6 (scroll further down for full pseudocode):
let reverseString = (string) => string.length === 0 ? '' : string[string.length - 1] + reverseString(string.slice(0, -1));

//Answers with step-by-step pseudocode:

//Pre ES6:
//initialize the variable reverseString to the value of a function with one parameter, string
var reverseString = function(string) {

//base case 
  //if the length of string is strictly equal to 0
  if (string.length === 0) {
   //return an empty string (no spaces to avoid adding something extra to your string)
   return '';
  }

//recursion 
  //return the last character of string + a function call where the last character of string has been sliced out
  return string[string.length - 1] + reverseString(string.slice(0, -1));
};

console.log(reverseString('Look at this reversed string')) // => gnirts desrever siht ta kooL

//Post ES6:
//initialize reverseString to the value of a function with one parameter, string. use the ternary operator to check if string's length is strictly equal to 0, if it is- return an empty string. if not, return the string's last character added to the result of the function called again with the last character of string sliced off 
let reverseString = (string) => string.length === 0 ? '' : string[string.length - 1] + reverseString(string.slice(0, -1));

console.log(reverseString('Look at this reversed string')) // => gnirts desrever siht ta kooL

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: function javascript recursion reverse string using whatever

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Contributed on May 17 2023

Claire Happel

0 Answers Avg Quality 2/10

use recursion to reverse a string in javascript

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