JavaScript | Reverse a string in place.
In order to reverse the string in its place, We’re going to use a number of methods and the most preferred ones.
We’re going to use these methods(click to know more).
Example-1: This example reverses the string by first splitting it with (“”) separator and then reversing it and finally joining it by (“”) separator.
<!DOCTYPE html><html> <head> <title> JavaScript | Reverse a string in place. </title></head> <body style="text-align:center;" id="body"> <h1 style="color:green;"> GeeksForGeeks </h1> <p id="GFG_UP" style="font-size: 16px; font-weight: bold;"> </p> <button onclick="gfg_Run()"> Inplace Reverse </button> <p id="GFG_DOWN" style="color:green; font-size: 20px; font-weight: bold;"> </p> <script> var el_up = document.getElementById("GFG_UP"); var el_down = document.getElementById("GFG_DOWN"); var str = 'This is GeeksForGeeks'; el_up.innerHTML = "String = " + "'" + str + "'"; function gfg_Run() { el_down.innerHTML = str.split("").reverse().join(""); } </script></body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
Example-2: This example uses the concept of merge sort algorithm.
<!DOCTYPE html><html> <head> <title> JavaScript | Reverse a string in place. </title></head> <body style="text-align:center;" id="body"> <h1 style="color:green;"> GeeksForGeeks </h1> <p id="GFG_UP" style="font-size: 16px; font-weight: bold;"> </p> <button onclick="gfg_Run()"> Inplace Reverse </button> <p id="GFG_DOWN" style="color:green; font-size: 20px; font-weight: bold;"> </p> <script> var el_up = document.getElementById("GFG_UP"); var el_down = document.getElementById("GFG_DOWN"); var str = 'This is GeeksForGeeks'; el_up.innerHTML = "String = " + "'" + str + "'"; function reverse(s) { if (s.length < 2) return s; var hIndex = Math.ceil(s.length / 2); return reverse(s.substr(hIndex)) + reverse(s.substr(0, hIndex)); } function gfg_Run() { el_down.innerHTML = reverse(str); } </script></body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
Example-3:This example takes a variable and appending the result from the end of the string.
<!DOCTYPE html><html> <head> <title> JavaScript | Reverse a string in place. </title></head> <body style="text-align:center;" id="body"> <h1 style="color:green;"> GeeksForGeeks </h1> <p id="GFG_UP" style="font-size: 16px; font-weight: bold;"> </p> <button onclick="gfg_Run()"> Inplace Reverse </button> <p id="GFG_DOWN" style="color:green; font-size: 20px; font-weight: bold;"> </p> <script> var el_up = document.getElementById("GFG_UP"); var el_down = document.getElementById("GFG_DOWN"); var str = 'A Computer Science Portal' el_up.innerHTML = "String = " + "'" + str + "'"; function reverse(s { for(var i = s.length - 1, o = ''; i >= 0; o += s[i--]) {} return o; } function gfg_Run() { el_down.innerHTML = reverse(str); } </script></body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
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