How to Efficiently Remove Duplicate Elements from a Go Slice?

Removing Duplicate Strings or Integers from a Slice in Go

Problem:
You have a slice of students' cities that may contain duplicate entries. You want to create a generic solution to remove all duplicate strings from any slice.

Inefficient Solution:
Your current solution involves checking each element in the slice for existence in another loop, which is inefficient for large slices.

Efficient Solution: Using a Map
An efficient way to remove duplicates is to use a map to store unique elements. As you iterate through the slice, check if the current element exists in the map. If not, add it to the map and the filtered result.

Generic Solution:
Here's a generic function to remove duplicates from any slice, where T can be any comparable type:

func removeDuplicate[T comparable](sliceList []T) []T {
    allKeys := make(map[T]bool)
    list := []T{}
    for _, item := range sliceList {
        if _, value := allKeys[item]; !value {
            allKeys[item] = true
            list = append(list, item)
        }
    }
    return list
}

Specific Solutions for Strings and Integers:
To simplify your code, you can also create specific functions for strings and integers:

func removeDuplicateStr(strSlice []string) []string {
    // [Remove duplicate code here]
}

func removeDuplicateInt(intSlice []int) []int {
    // [Remove duplicate code here]
}

Example Usage:

studentsCities := []string{"Mumbai", "Delhi", "Ahmedabad", "Mumbai", "Bangalore", "Delhi", "Kolkata", "Pune"}

uniqueStudentsCities := removeDuplicate(studentsCities)
fmt.Println(uniqueStudentsCities) // Output: ["Mumbai", "Delhi", "Ahmedabad", "Bangalore", "Kolkata", "Pune"]

Using this approach, you can effectively remove duplicates from any slice, regardless of its type.

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