Accessing Map Values
We can access the value corresponding to a key in a map using the following syntax:
index.go
1mapName["keyName"]
For example:
index.go
1234567891011121314package main import "fmt" func main() { prices := map[string]int { "apple": 100, "banana": 120, "peach": 170, } fmt.Println(prices["apple"]) // Output: 100 fmt.Println(prices["banana"]) // Output: 120 fmt.Println(prices["peach"]) // Output: 170 }
The expression prices["apple"]
essentially references the memory location where the value 100
is stored; hence, it acts like a variable. Therefore, we can edit the value stored at that key using the =
operator:
index.go
12345678910111213package main import "fmt" func main() { prices := map[string]int { "apple": 100, "banana": 120, "peach": 170, } prices["apple"] = 160 fmt.Println(prices["apple"]) // Output: 160 }
We can use the same assignment syntax to create a new key in the map:
mapName["keyName"] = value
If the provided keyName
doesn't exist in the map, it will create and add a new key to the map with the assigned value.
index.go
1234567891011121314151617package main import "fmt" func main() { numbers := map[string]int { "one": 1, "two": 2, "three": 3, } fmt.Println(numbers) // Output: map[one:1 three:3 two:2] numbers["four"] = 4 fmt.Println(numbers) // Output: map[four:4 one:1 three:3 two:2] }
Thanks for your feedback!
Ask AI
Ask AI
Ask anything or try one of the suggested questions to begin our chat
Awesome!
Completion rate improved to 1.96
Accessing Map Values
Swipe to show menu
We can access the value corresponding to a key in a map using the following syntax:
index.go
1mapName["keyName"]
For example:
index.go
1234567891011121314package main import "fmt" func main() { prices := map[string]int { "apple": 100, "banana": 120, "peach": 170, } fmt.Println(prices["apple"]) // Output: 100 fmt.Println(prices["banana"]) // Output: 120 fmt.Println(prices["peach"]) // Output: 170 }
The expression prices["apple"]
essentially references the memory location where the value 100
is stored; hence, it acts like a variable. Therefore, we can edit the value stored at that key using the =
operator:
index.go
12345678910111213package main import "fmt" func main() { prices := map[string]int { "apple": 100, "banana": 120, "peach": 170, } prices["apple"] = 160 fmt.Println(prices["apple"]) // Output: 160 }
We can use the same assignment syntax to create a new key in the map:
mapName["keyName"] = value
If the provided keyName
doesn't exist in the map, it will create and add a new key to the map with the assigned value.
index.go
1234567891011121314151617package main import "fmt" func main() { numbers := map[string]int { "one": 1, "two": 2, "three": 3, } fmt.Println(numbers) // Output: map[one:1 three:3 two:2] numbers["four"] = 4 fmt.Println(numbers) // Output: map[four:4 one:1 three:3 two:2] }
Thanks for your feedback!