How to check if key exists in a map in different ways in Golang 1.20

In this video we are going to generate source code for the GoLang Program, How to check if key exists in a map in different ways using chatGPT.
After generating we will verify and run the generated code.

IMPORTANT NOTE on SOURCE CODE: only source code that are acceptable by the youtube description box will be displayed.

##############SOURCE CODE#########################

package main

import "fmt"

func main() {
// Declare a map of string keys and integer values
m := map[string]int{
"one": 1,
"two": 2,
"three": 3,
}

// Check if a key exists using the built-in function make
if _, ok := m["one"]; ok {
fmt.Println("'one' exists in the map")
} else {
fmt.Println("'one' does not exist in the map")
}

// Check if a key exists using the comma ok idiom
if _, ok := m["two"]; ok {
fmt.Println("'two' exists in the map")
} else {
fmt.Println("'two' does not exist in the map")
}

// Check if a key exists using the value returned by the index operator
if three := m["three"]; three != 0 {
fmt.Println("'three' exists in the map")
} else {
fmt.Println("'three' does not exist in the map")
}

// Check if a key exists using the built-in function delete
delete(m, "three")
if _, ok := m["three"]; ok {
fmt.Println("'three' exists in the map")
} else {
fmt.Println("'three' does not exist in the map")
}
}

Below is the explanation for the program:

In this program, we first declare a map of string keys and integer values using the map literal syntax and the syntax m := map[string]int{key1: value1, key2: value2, ...}.

We then check if a key exists in the map using different approaches:

Using the built-in function make(), which returns the value for the given key and a boolean flag indicating whether the key exists in the map or not.
We use the boolean flag to check if the key exists in the map.
We print a message saying that the key exists in the map using the statement fmt.Println("'one' exists in the map")
if it does, or a message saying that it does not using the statement fmt.Println("'one' does not exist in the map") if it does not.

Using the comma ok idiom, which assigns the value to a blank identifier _ and a boolean flag indicating whether the key exists in the map or not.
We use the boolean flag to check if the key exists in the map. We print a message saying that the key exists in the map using the
statement fmt.Println("'two' exists in the map") if it does, or a message saying that it does not using the statement fmt.Println("'two' does not exist in the map") if it does not.

Using the value returned by the index operator, which simply returns the value for the given key.
If the key does not exist in the map, the value returned will be the zero value for the value type (in this case, 0 for int).
We assign the value to a variable three and check if it is non-zero.
We print a message saying that the key exists in the map using the statement fmt.Println("'three' exists in the map") if it does,
or a message saying that it does not using the statement fmt.Println("'three' does not exist in the map") if it does not.

Using the built-in function delete(), which removes the key-value pair from the map.
We use the boolean flag returned by the function to check if the key exists in the map.

#go #goprogramming #golang #golangtutorial #golanguage