How to check if a value exists in a map in Golang

package main
//program execution starts here
func main(){
  //declare a map
  students := map[string]int{
    "john": 10,
    "james": 12,
    "mary":13,
  }
  
  //provide user value 
  var userValue = 10
  //call function and proceed according to return
  if checkForValue(userValue,students){
    //executes if a value is present in the map
    println("Value found")
  }else{
    //executes if a value is NOT present in the map
    println("Value NOT found in the map")
  }
  
  
}
//function to check if a value present in the map
func checkForValue(userValue int, students map[string]int)bool{
  //traverse through the map
  for _,value:= range students{
    //check if present value is equals to userValue
    if(value == userValue){
      //if same return true
      return true
    }
  }
  //if value not found return false
  return false
}

Explanation

We declare and initialize a map students, with the key as the student’s name and the value as their age.
Line 14: We provide user input.
Line 30: We declare the function that accepts the userValue and students as parameters and returns a boolean value.
- Line 33: We traverse through the map, students, and check if the present value equals the userValue. If it is equal, return true.
- Line 44: If the userValue is not found in the map after traversing, return false.
Line 17: We call the checkForValue function and use an if statement to check if the returned value is true or false. We then display the output accordingly.

License: Creative Commons-Attribution-ShareAlike 4.0 (CC-BY-SA 4.0)

Learn in-demand tech skills in half the time

PRODUCTS

Mock Interview

New

Courses

Skill Paths

Projects

Assessments

How to check if a value exists in a map in Golang

Example

Code

Explanation