[Term Entry] C++ Deque Clear()

content/cpp/concepts/deque/terms/clear/clear.md

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+---
+Title: '.clear()'
+Description: 'Removes all elements from the deque.'
+Subjects:
+  - 'Computer Science'
+  - 'Game Development'
+Tags:
+  - 'Classes'
+  - 'Containers'
+  - 'Deques'
+  - 'OOP'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+In C++, the **`.clear()`** [method](https://www.codecademy.com/resources/docs/cpp/methods) removes all elements from the deque container, leaving the container with a size of 0.
+
+## Syntax
+
+```pseudo
+dequeName.clear();
+```
+
+- `dequeName`: The name of the deque container from which all elements will be removed.
+
+## Example
+
+The example below showcases the use of the `.clear()` method:
+
+```cpp
+#include <iostream>
+#include <deque>
+
+int main() {
+  // Create a deque of integers
+  std::deque<int> numbers;
+
+  // Add elements to the deque
+  numbers.push_back(50);
+  numbers.push_back(100);
+  numbers.push_back(150);
+  numbers.push_back(200);
+
+  // Display the elements of the deque before clearing
+  std::cout << "My deque contains: ";
+  for (int num : numbers) {
+    std::cout << num << " ";
+  }
+
+  // Clear all elements from the deque
+  numbers.clear();
+  std::cout << std::endl;
+
+  numbers.push_back(200);
+
+  // Display the elements of the deque after clearing and adding a new element
+  std::cout << "My deque contains: ";
+  for (int num : numbers) {
+    std::cout << num << " ";
+  }
+
+  std::cout << std::endl;
+
+  return 0;
+}
+```
+
+The above code generates the following output:
+
+```shell
+My deque contains: 50 100 150 200 
+My deque contains: 200 
+```
+
+## Codebyte Example
+
+The following codebyte demonstrates the use of the `.clear()` method, which removes all elements from the deque before adding a new element:
+
+```codebyte/cpp
+#include <iostream>
+#include <deque>
+#include <string>
+
+int main() {
+  std::deque<std::string> myDeque;
+
+  myDeque.push_back("A");
+  myDeque.push_back("B");
+  myDeque.push_back("C");
+
+  myDeque.clear();
+  myDeque.push_back("D");
+
+  for (const auto& value : myDeque) {
+    std::cout << ' ' << value;
+  }
+}
+```