[Golang] Mastering Slice Merging in Go: Utilize Append with Ellipsis Operator for Efficiency

I have value a := model.HPAUtilizations and value b := model.HPAUtilizations

The format of values is defined via the below struct:

package model

type HPAUtilizations []HPAUtilization

type HPAUtilization struct {
    MetricName         string
    MetricType         string
    HPAOwner           string
    ScaleTargetRefKind string
    ScaleTargetRefName string
    AverageUtilization float64
}

How to add b to a ????

To add one HPAUtilizations slice (b) to another (a), you can use the append function in Go. The append function can take multiple elements to append to the slice. Since you’re dealing with slices of a custom struct HPAUtilization, you can append the entire slice b to a using the ... operator, which expands the slice b into a list of arguments.

Here’s how you can do it:

a := model.HPAUtilizations{} // Assuming 'a' is already defined and possibly has elements
b := model.HPAUtilizations{} // Assuming 'b' is another slice you want to add to 'a'

// Add 'b' to 'a'
a = append(a, b...)

// Now 'a' contains all its original elements plus all elements from 'b'

This operation does not modify the original slice b; instead, it creates a new slice by appending all elements of b to a and then assigns this new slice back to a. The ... operator is essential here as it tells append to treat b as a list of arguments rather than a single argument.