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Golang program to get value from the hash collection based on specified key
In this golang article, we will write Go language programs to get the value from the hash collection based on a specified key using found variable as well as using ok idiom method.
A hash map is a data structure that belongs to the hash collection. It stores the data in the form of key value pairs.
Syntax
func make ([] type, size, capacity)
The make function in go language is used to create an array/map it accepts the type of variable to be created, its size and capacity as arguments.
Algorithm
Step 1 − This program imports two packages fmt and main where fmt helps in the formatting of input and output and main helps in generating executable codes
Step 2 − Create a main function
Step 3 − In the main, create a hashmap using the make function which is a type of built-in function in Golang
Step 4 − Assign the value to the keys in the map
Step 5 − In this step, set the key whose value is to be obtained
Step 6 − Then, with the hep of found variable see the value is present in the map or not
Step 7 − If the found is true print the value of the key
Step 8 − If the found is false, this implies that no value is obtained for the key
Step 9 − The print statement is executed using the Printf function from the fmt package
Example 1
In this Example, we will create a hashmap using make function which a type of built-in function. Then, with the help of found variable value for the specified key will be obtained.
package main
import "fmt"
func main() {
hashmap := make(map[string]string)
hashmap["saree"] = "red"
hashmap["kurti"] = "blue"
hashmap["jacket"] = "green"
key := "saree"
value, found := hashmap[key]
if found {
fmt.Printf("The value for key '%s' is '%s'\n", key, value)
} else {
fmt.Printf("No value found for key '%s'\n", key)
}
}
Output
The value for key 'saree' is 'red'
Example 2
In this illustration, we will create a hashmap and find the value from the map based on the key using ok idiom. ok returns either true or false.
package main
import "fmt"
func main() {
hashmap := map[string]int{
"pencils": 5,
"pens": 10,
"registers": 15,
}
key := "pens"
value, ok := hashmap[key]
if ok {
fmt.Printf("The value for key '%s' is '%d'\n", key, value)
} else {
fmt.Printf("No value found for key '%s'\n", key)
}
}
Output
The value for key 'pens' is '10'
Conclusion
We have successfully compiled and executed the program to get the value based on a specified key. In the first Example we used found variable to get the value based on a specified key and in the second Example we used ok idiom to perform the execution.
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