How To Compare Two Slices In Golang

Go Programming

Comparing two slices in Go can be a common task when working with arrays or collections of data. In this article, I’ll guide you through the process of comparing two slices in Go and provide some personal insights and commentary along the way.


Slices in Go are flexible and powerful data structures that allow you to store and manipulate sequences of elements. When comparing two slices, you might want to check if they have the same elements, the same length, or if one slice is a subset of the other. Let’s dive into the details and explore different ways to compare slices in Go.

Comparing Slice Elements

When comparing two slices in Go, the first thing you may want to check is if they have the same elements in the same order. To do this, you can iterate over both slices and compare each corresponding element.

// Comparing slice elements
func compareSlices(a, b []int) bool {
if len(a) != len(b) {
return false

for i := 0; i < len(a); i++ { if a[i] != b[i] { return false } } return true }

By iterating over the slices, we compare the elements at each index. If we find any pair of elements that are not equal, we can immediately return false. Otherwise, if we reach the end of the loop without finding any differences, we can conclude that the slices are equal.

Comparing Slice Length

In some cases, you may only need to compare the lengths of two slices. This can be useful when you want to quickly check if two slices have the same number of elements.

// Comparing slice length
func compareSliceLength(a, b []int) bool {
return len(a) == len(b)

The compareSliceLength function takes two slices as input and returns true if their lengths are equal, and false otherwise.

Checking if One Slice is a Subset of Another

Another common comparison scenario is checking if one slice is a subset of another. To accomplish this, we can use the reflect.DeepEqual function from the reflect package.

// Checking if one slice is a subset of another
func isSubset(a, b []int) bool {
return reflect.DeepEqual(a, b)

The reflect.DeepEqual function compares the contents of two slices and returns true if they are deeply equal, meaning that each element is equal and in the same order. However, it's important to note that reflect.DeepEqual has some limitations and may not work as expected for all data types. Therefore, it's always a good idea to consider the specific requirements of your use case.


Comparing two slices in Go can be done in several ways, depending on your specific needs. Whether you want to compare the elements, the length, or check for subset relationships, Go provides built-in functions and mechanisms to make the comparison process straightforward. By understanding these techniques and considering the specific requirements of your code, you'll be able to compare slices effectively and efficiently.