C++ Count function map

content/cpp/concepts/maps/terms/count/count.md

@@ -0,0 +1,98 @@
+---
+Title: '.count()'
+Description: 'Checks whether a specified key exists in the map and returns the number of occurrences'
+Subjects:
+  - 'Computer Science'
+  - 'Game Development'
+  - 'Machine Learning'
+Tags:
+  - 'Objects'
+  - 'OOP'
+  - 'Classes'
+  - 'Map'
+CatalogContent:
+  - 'learn-c-plus-plus'
+  - 'paths/computer-science'
+---
+
+The **`.count()`** method in C++ for `std::map` is used to determine the presence of a specific key in the map. Since all keys in a map are unique, the function returns:
+
+- _1_ if the key exists in the container.
+- _0_ if the key does not exist.
+
+## Syntax
+
+```pseudo
+mapName.count(key)
+```
+
+- `mapName`: Refers to the specific map being accessed.
+- `key`: Represents the value that will be searched for in `mapName`.
+
+## Example
+
+In the following example, the `.count()` method is used to check whether the keys `"coconuts"` and `"strawberries"` exist in the `fruits` map:
+
+```cpp
+#include <iostream>
+#include <map>
+#include <string>
+
+int main() {
+  // Initializing map with items
+  std::map<std::string, int> fruits {{"apples", 50}, {"bananas", 100}, {"coconuts", 20}, {"dates", 500}};
+
+  // Checking if "coconuts" exists
+  std::string key = "coconuts";
+
+  if (fruits.count(key) > 0) {
+    std::cout << "There are " << fruits[key] << " " << key << ".\n"; // If key exists, print the count
+  } else {
+    std::cout << "There are no " << key << ".\n"; // If key does not exist, print a message
+  }
+
+  // Checking if "strawberries" exists
+  key = "strawberries";
+
+  if (fruits.count(key) > 0) {
+    std::cout << "There are " << fruits[key] << " " << key << ".\n"; // If key exists, print the count
+  } else {
+    std::cout << "There are no " << key << ".\n"; // If key does not exist, print a message
+  }
+
+  return 0;
+}
+```
+
+The above code produces the following output:
+
+```shell
+There are 20 coconuts.
+There are no strawberries.
+```
+
+## Codebyte Example
+
+The example below illustrates a scenario in which the `.count()` method is used to check whether an array of elements exists in a map:
+
+```codebyte/cpp
+#include <iostream>
+#include <map>
+#include <string>
+
+int main() {
+  std::map<std::string, int> zoo_animals {{"hippos", 2}, {"lions", 4},  {"zebras", 6}, {"gorillas", 8}};
+
+  std::string animals_to_check[] = {"bats", "giraffes", "gorillas", "hippos", "zebras"};
+
+  for (const auto& animals : animals_to_check) {
+        if (zoo_animals.count(animals) > 0) {
+            std::cout << "The zoo has " << zoo_animals[animals] << " " << animals << ".\n";
+        } else {
+            std::cout << "The zoo does not have " << animals << ".\n";
+        }
+    }
+
+    return 0;
+}
+```