How to Safely Remove Elements from an Array of Structs in Go Loops?

Removing Elements from an Array of Structs in Go Loops

When manipulating arrays of structs within loops, it's crucial to handle element deletion correctly. An attempt to remove an element by key from config.Applications in the code snippet provided results in an "out of range" error. A proper approach is necessary to address this issue effectively.

The commonly suggested method of removing an element from a slice is using the append function to merge the slices before and after the element to be removed:

a = append(a[:i], a[i+1:]...)

However, using this method in the given loop caused errors because the loop incremented the index after removing an element, potentially skipping elements.

To avoid this issue, consider using a downward loop instead:

for i := len(config.Applications) - 1; i >= 0; i-- {
    application := config.Applications[i]
    // Condition to decide if current element has to be deleted:
    if haveToDelete {
        config.Applications = append(config.Applications[:i],
            config.Applications[i+1:]...)
    }
}

By starting from the last index and traversing downward, this loop ensures that element deletions don't affect subsequent loop iterations. The append function is still used to merge the slices, effectively removing the target element.

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