How Can I Efficiently Check for Slice Containment in Go?

Slice Containment Check in Go

In Go, finding if an element is present in a slice without iterating over each item can be done efficiently.

Trivial Method

As Mostafa mentioned, a custom method can be created to simplify the task:

func SliceContains(slice []T, target T) bool {
    for _, item := range slice {
        if item == target {
            return true
        }
    }
    return false
}

Binary Search

Alternatively, mkb suggested using the binary search from the sort package. This approach requires a pre-sorted slice and is efficient for large datasets.

sort.Slice(slice, func(i, j int) bool { return slice[i] <p><strong>Map Optimization</strong></p><p>If frequent containment checks are required, using a map instead of a slice may provide better performance.</p><pre class="brush:php;toolbar:false">type Set map[string]struct{}

func (s Set) Contains(key string) bool {
    _, ok := s[key]
    return ok
}

Using an empty struct{} value in the map reduces memory overhead and optimizes map performance. Set is commonly used for set-like operations in Go.

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