Learn Go: Maps
Go Map Creation
In Go, an empty map can be created using make. The type of keys and values are specified.
variableName := make(map[keyType]valueType)
Go Map Initialization
In Go, a map can be intialized with key:value data.
variableName := map[keyType]valueType{key1, value1,key2, value2,key3, value3,}
Go Map Access
In Go, any value can be accessed by specifying the associated key. A second value can be returned to check if the key is in the map.
value := yourMap[key]checkedValue,isFound := yourMap[key]
Go Adding to a Map
In Go, additional key:value pairs can be added to the map by specifying the new key and its value.
yourMap[newKey] = newValue
Go Updating a Map
In Go, existing values can be updated by specifying a key and an updated value.
yourMap[existingKey] = newValue
Go Map Deletions
In Go, key:value pairs can be removed with the delete syntax where a map and key are specified.
delete(yourMap, keyValueToDelete)
Go Maps
In Go, a map is an unordered collection of key:value pairs. Keys are used as a way to access a value. Maps are used to associate one piece of data with another.
Example use cases include:
- Counting the number of times unique names appear in a list.
- Mapping simple identifiers, such as an employee id, to related values.
- Anytime we need to associate any piece of data with another!
