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Golang program to check a given key exists in the hash collection or not
In Golang we have inbuild function like ok idiom to check whether a given key exist in hash collection or not. Hashmap is a collection of values paired with key in hashmap collection. In this article, we will create a hashmap using the built-in function then we will use ok idiom that returns true false value to check whether a key exists in the map or not. In this way a success or failure statement will be printed.
Algorithm
Create a package main and declare fmt(format package) in the program where main produces executable codes and fmt helps in formatting input and output.
Create a main function and in the same function create a hashmap using map where keys are of type string and values are of type int.
Now, assign the key=item2 and using ok idiom and indexing check whether the particular key exists in the map or not.
If ok is true, print the success statement else print the failure statement.
In this step, we will repeat the step3 but this time with another key which doesn’t exist in the map i.e. item4.
We will use ok idiom to check if the key is present in the map or not, as ok will be false here so failure statement will be printed.
The output will be reflected on the console using Println function from fmt package where ln means new line.
Example
Golang program to check a given key exists in the hash collection or not using ok idiom function
package main
import "fmt"
//Main function to execute the program
func main() {
// create a hash collection
hashmap := map[string]string{
"item1": "value1",
"item2": "value2",
"item3": "value3",
}
// check if a key exists in the hashmap
key := "item2"
if _, ok := hashmap[key]; ok {
fmt.Printf("Item '%s' exists in the hash collection.\n", key)
} else {
fmt.Printf("item '%s' does not exist in the hash collection.\n", key)
}
// check if this key exists in the map or not (not found)
key = "item4"
if _, ok := hashmap[key]; ok {
fmt.Printf("Item '%s' exists in the hash collection.\n", key)
} else {
fmt.Printf("Item'%s' does not exist in the hash collection.\n", key)
}
}
Output
Item 'item2' exists in the hash collection. Item'item4' does not exist in the hash collection.
Conclusion
We executed the program to check a given key exists in the hash collection or not using an example in which we used ok idiom to execute the program. The program executed successfully.
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