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  1. PO
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    <p>As <a href="https://stackoverflow.com/a/19374861/1567738">mentioned by ANisus</a>, different approaches will suit different sizes of input slices. This solution will work in linear time <code>O(n)</code> independent of input size, but assumes that the "equality" includes index position.</p> <p>Thus, in the OP's examples of:</p> <pre><code>slice1 := []string{"foo", "bar","hello"} slice2 := []string{"foo", "bar"} </code></pre> <p>The entries <code>foo</code> and <code>bar</code> are equal not just due to value, but also due to their index in the slice.</p> <p>Given these conditions, you can do something like:</p> <pre><code>package main import "fmt" func difference(s1, s2 []string) string { var ( lenMin int longest []string out string ) // Determine the shortest length and the longest slice if len(s1) &lt; len(s2) { lenMin = len(s1) longest = s2 } else { lenMin = len(s2) longest = s1 } // compare common indeces for i := 0; i &lt; lenMin; i++ { if s1[i] != s2[i] { out += fmt.Sprintf("=&gt;\t%s\t%s\n", s1[i], s2[i]) } } // add indeces not in common for _, v := range longest[lenMin:] { out += fmt.Sprintf("=&gt;\t%s\n", v) } return out } func main() { slice1 := []string{"foo", "bar", "hello"} slice2 := []string{"foo", "bar"} fmt.Print(difference(slice1, slice2)) } </code></pre> <p>Produces:</p> <blockquote> <blockquote> <p>=> hello</p> </blockquote> </blockquote> <p><a href="http://play.golang.org/p/tAEmJvpGp5" rel="nofollow noreferrer">Playground</a></p> <p>If you change the slices to be:</p> <pre><code>func main() { slice1 := []string{"foo", "baz", "hello"} slice2 := []string{"foo", "bar"} fmt.Print(difference(slice1, slice2)) } </code></pre> <p>It will produce:</p> <blockquote> <blockquote> <p>=> baz bar<br> => hello</p> </blockquote> </blockquote>
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    1. POHow to find the difference between two slices of strings in Golang?
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    1. USCommunity
    1. USIntermernet
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    1. VO
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    1. COBut what about: `slice1 := []string{"foo", "bar", "hello"}` and `slice2 := []string{"foox","foo", "bar"}`? The program outputs `foo` and `bar`, which are in both slices.
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    2. CO@topskip Intermernet made the presumption that OP wanted to compare each index with the equivalent index. OP wasn't very clear in what kind of comparison he wanted considering order and index values.
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      1. USANisus
    3. CO@ANisus you're right, I've missed that. I think I will leave my comment though, so that future users are aware of that issue.
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