Learn how to effectively reverse a string in javascript.
Strings can be treated as an array like object in javascript and we can use this advantage to perform different actions on it.
Reversing a string with inbuilt methods.
We are going to follow the following approach to reverse the given string.
- split(): This method will split the string at given expression into an array of characters.
- reverse(): This method reverses all the elements of an array.
- join(): This method joins all the elements of the array at a given expression to create a string.
Using all the above methods in line we can reverse any string with ease in javascript.
let str = 'learnersbucket'; let reversed = str.split('').reverse().join(''); console.log(reversed); //'tekcubsrenrael' Explanation
Passing '' in split() method will split the each character of the string.
let str = 'learnersbucket'; console.log(str.split('')); //["l", "e", "a", "r", "n", "e", "r", "s", "b", "u", "c", "k", "e", "t"] Now once we have an array of character we can reverse it with the reverse() method.
console.log(str.split('').reverse()); //["t", "e", "k", "c", "u", "b", "s", "r", "e", "n", "r", "a", "e", "l"] We can now create our reversed string by joining all the elements of the array.
console.log(str.split('').reverse().join('')); //'tekcubsrenrael' Brute force approach to reverse a string
As we already know strings are an array like object in javascript. We can just simply loop through each character of the string in reverse order and form a reversed string.
let str = 'learnersbucket'; let reversed = ''; for(let i = str.length - 1; i >= 0; i--){ reversed += str[i]; } console.log(reversed); //'tekcubsrenrael' We can extend the String.prototype to have a method to reverse a string.
//ES5 String.prototype.reverse = function () { let reversed = ''; for(let i = this.length - 1; i >= 0; i--){ reversed += this[i]; } return reversed; } let str = 'learnersbucket'; console.log(str.reverse()); //'tekcubsrenrael' Extending the same in ES6 with Object.assign.
Object.assign(String.prototype, { reverse() { let reversed = ''; for(let i = this.length - 1; i >= 0; i--){ reversed += this[i]; } return reversed; } }); let str = 'learnersbucket'; console.log(str.reverse()); //'tekcubsrenrael'