Reverse a given string, also using similar technique reverse a sentence without reversing words
Reverse a given string
Input : A string // 'Hello'
Output : A string // 'olleH'
There are many ways of reversing a string.
Approach 1 : Simplest way is to use inbuilt javascript methods.
Logic :
- Convert a given string into an array using
String.prototype.split()with appropriate separator. - Reverse a newly formed array using
Array.prototype.reverse(). - Convert a given array back to string
Array.prototype.join()with appropriate separator.
Solution :
Approach 2 : If you are not allowed to use the inbuilt methods of JavaScript then you can use this approach. This approach is computationally efficient compared to approach1.
Logic :
- Iterate over first string from the right most character to the left most character and append those characters.
Solution :
Reverse a given multiple words string without reversing the words
Input : A string with mutiple words // 'This is cat'
Output : A string // 'cat is This'
Logic :
There are many ways of reversing a multiple words string, simplest way is to use inbuilt javascript methods.
We will use the similar logic as described in the previous question.
Solution :