Closes #7134 : Added a new entry for swap() method under strings in C++.

content/cpp/concepts/strings/terms/swap/swap.md

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+---
+Title: '.swap()'
+Description: 'Exchanges the contents of two strings.'
+Subjects:
+  - 'Computer Science'
+  - 'Game Development'
+Tags:
+  - 'Functions'
+  - 'Methods'
+  - 'Strings'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+In C++, the **`.swap()`** method for strings is used to exchange the contents of two strings efficiently. It is commonly used in scenarios like optimizing performance during reordering, implementing the copy-and-swap idiom in custom classes, or quickly clearing a string by swapping it with an empty one.
+
+## Syntax
+
+```pseudo
+string1.swap(string2);
+```
+
+**Parameters:**
+
+- `string2`: Another `std::string` object whose contents will be swapped with `string1`.
+
+**Return value:**
+
+This method performs the swap in-place and does not return a value.
+
+After calling the `.swap()` method, the contents of `string1` and `string2` are exchanged: `string1` now holds the original contents of `string2`, and `string2` holds the original contents of `string1`.
+
+## Example
+
+In this example, the `.swap()` method is used to exchange the contents of two strings, `a` and `b`:
+
+```py
+#include <iostream>
+#include <string>
+
+int main() {
+  std::string a = "apple";
+  std::string b = "banana";
+
+  std::cout << "Before swap:\n";
+  std::cout << "a = " << a << "\n";
+  std::cout << "b = " << b << "\n";
+
+  // Swap the contents of a and b
+  a.swap(b);
+
+  std::cout << "\nAfter swap:\n";
+  std::cout << "a = " << a << "\n";
+  std::cout << "b = " << b << "\n";
+
+  return 0;
+}
+```
+
+The output for this will be:
+
+```shell
+Before swap:
+a = apple
+b = banana
+
+After swap:
+a = banana
+b = apple
+```
+
+## Codebyte Example
+
+In this codebyte example, `.swap()` is called on the `place1` and `place2` strings:
+
+```codebyte/cpp
+#include <iostream>
+#include <string>
+
+int main() {
+
+  std::string place1 = "Los Angeles";
+  std::string place2 = "New York";
+
+  std::cout << "Before swap:\n";
+  std::cout << "Place 1 : " << place1 << "\n";
+  std::cout << "Place 2 : " << place2 << "\n";
+
+  place1.swap(place2);
+
+  std::cout << "After swap:\n";
+  std::cout << "Place 1 : " << place1 << "\n";
+  std::cout << "Place 2 : " << place2 << "\n";
+
+  return 0;
+}
+```