Go Maps

What is a Go Map?

A Go map is a built-in data structure that stores collections of key-value pairs. Each key is unique within a map, and it is used to retrieve the corresponding value. Maps are highly versatile and are commonly used for fast data retrieval.

Creating a Map with Make

In Go, maps are initialized using the make function. The make function is essential for creating maps because it allocates and initializes the map data structure.

Accessing and Modifying Map Elements

You can access and modify elements in a map using the keys. If you access a key that does not exist, Go returns the zero value for the map's value type.

Checking for Key Existence

To check if a key exists in a map, you can use the value, ok idiom. This idiom checks whether the key is present in the map and returns a boolean indicating its presence.

Deleting Elements from a Map

To remove a key-value pair from a map, use the delete function. This function takes the map and the key to be removed as arguments.

Iterating Over a Map

You can iterate over a map using a for loop with the range keyword. This allows you to access both keys and values in the map.