Zrjydtj

I want reverse the string with the same order. We should not use the Array functions like split(), .reverse() and some other array functions also except array.length.

Here i am attached my code. How to achieve that thing more efficiently.

var str = "i am javascript";
// result "i ma tpircsavaj"
function reverseString(myStr)
 var strlen = myStr.length, result = "", reverseStr = "", reverseStrArr = [];
 for(var i = strlen-1; i >= 0; i--)
 reverseStr += myStr[i];
 

 for(var j = 0; j < strlen; j++)
 if(reverseStr[j] == " ")
 reverseStrArr.push(result);
 result = "";
 else
 result += reverseStr[j];
 if(j + 1 == strlen)
 reverseStrArr.push(result);
 result = "";
 
 
 

 for(var k=reverseStrArr.length - 1; k >= 0; k--)
 result += reverseStrArr[k] + " "
 
 console.log(result);

reverseString(str);

I would split this into two function, simply because they do different things:

First a simple string reverser:

function reverseString(input)

 var output = "";
 for(var i = input.length - 1; i >= 0; i--) 
 output += input[i];
 
 return output;
 

This is an easy function that everybody can understand. But we need to reverse words, so we make another function for that.

function reverseWords(input)

 var word = "", output = "";
 for(var i = input.length - 1; i >= 0; i--) 
 if (input[i] == " ") 
 output += reverseString(word) + " ";
 word = "";
 
 else 
 word += input[i];
 
 
 output += reverseString(word);
 return output;
 

And that's it. Now this might not be the niftiest, or shortest, solution, but it is one that reasonably easy to understand, and you get two functions for the price of one.

Also notice that there's no erroneous space at the end anymore.

:-)
Hello kallis,

Could please clarify why you don't want to put your string in an array ?

Indeed, you could use a call back function with a map method on an array of words.
The callback function would reverse each word, while keeping them at the same place in the sentence.

let str = "I am Javascript" ; 
const arrStr = (string) => 
 const string2 = string.split(' ') ;
 return string2 ; 

let strInArray = arrStr(str) ; 

strInArray = strInArray . map ( word => 
 let l = word.length ; 
 let output = '' ; 

 for (var i=l-1 ; i>=0 ; i--) 
 output += word[i] ; 
 
 return output ; 
 // End of callback function

) ; // End of map method

console.log(strInArray.join(' ')) ;`