Variables
Maps in Go
Maps are used to store key-value pairs.
Syntax
mapName := map[keyDataType]valueDataType
//assign key value
mapName[key] = value
//declare and initialize at once
initMap := map[keyDataType]valueDataType{key: value}Notes
Maps are dynamically sized.
These are equivalent to dictionaries, associative arrays, and HashMaps in other languages.
A pair can be deleted from a map using the 'delete(mapName, key)' function.
A second variable can be assigned to the result of fetching the key to check for presence of the key. Check the example below.
Example
grades := map[string]int
grades["Paul"] = 85
grades["Alan"] = 75
fmt.Println("Paul's grade is: ", grades["Paul"])
//check for presence of student in map
if grade, present = grades["Anthony"]; present == true {
fmt.Println("Anthony is present.")
else {
fmt.Println("Anthony is not present")
}