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How to sort strings in JavaScript?

  • Difficulty Level : Easy
  • Last Updated : 17 Jun, 2019

We can sort the strings in JavaScript by following methods described below:

  • Using sort() method
  • Using loop

Using sort() method: In this method, we use predefined sort() method of JavaScript to sort the array of string. This method is used only when the string is alphabetic. It will produce wrong results if we store numbers in an array and apply this method.

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Examples:

Original String
Suraj, Sanjeev, Rajnish, Yash, Ravi
After sorting
Rajnish, Ravi, Sanjeev, Suraj, Yash



Original String
40, 100, 1, 5, 25, 10
After sorting
1, 10, 100, 25, 40, 5

Below program illustrates the above approach:

Program:




<script>
// JavaScript code to sort strings
      
// Original string
var string = ["Suraj", "Sanjeev", "Rajnish", "Yash", "Ravi"];
      
// Print original string array
document.write("Original String</br>");
document.write(string);
      
document.write("</br>");
      
// Use sort() method to sort the strings
string.sort();
      
document.write("</br>After sorting</br>");
      
// Print sorted string array
document.write(string);
      
</script>                    

Output:

Original String
Suraj, Sanjeev, Rajnish, Yash, Ravi

After sorting
Rajnish, Ravi, Sanjeev, Suraj, Yash

Using loop: We will use a simple approach of sorting to sort the strings. In this method, we will use a loop and then compare each element and put the string at its correct position. Here we can store numbers in an array and apply this method to sort the array.
Examples:

Original String
Suraj,Sanjeev,Rajnish,Yash,Ravi
After sorting
Rajnish,Ravi,Sanjeev,Suraj,Yash

Original String
40, 100, 1, 5, 25, 10
After sorting
1,5,10,25,40,100

Below program illustrates the above approach:

Program:




<script>
// JavaScript code to sort the strings
  
// Function to perform sort
function string_sort(str) {
    var i = 0, j;
    while (i < str.length) {
        j = i + 1;
        while (j < str.length) {
            if (str[j] < str[i]) {
                var temp = str[i];
                str[i] = str[j];
                str[j] = temp;
            }
            j++;
        }
        i++;
    }
}
      
// Driver code
      
// Original string
var string = ["Suraj", "Sanjeev", "Rajnish", "Yash", "Ravi"];
      
// Print original string array
document.write("Original String</br>");
document.write(string);
      
document.write("</br>");
      
// Call string_sort method
string_sort(string);
      
document.write("</br>After sorting</br>");
      
// Print sorted string array
document.write(string);
      
</script>                                  

Output:

Original String
Suraj, Sanjeev, Rajnish, Yash, Ravi

After sorting
Rajnish, Ravi, Sanjeev, Suraj, Yash



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