Appending/inserting/deleting slice elements

Slices use arrays as their underlying storage, but it is not possible to grow arrays when you run out of space. Because of this, if an append operation exceeds the slice capacity, a new and larger array is allocated, and slice contents are copied to this new array.

How to do it...

To add new values to the end of the slice, use the append built-in function:

// Create an empty integer slice
islice := make([]int, 0)
// Append values 1, 2, 3 to islice, assign it to newSlice
newSlice := append(islice, 1, 2, 3)
// islice:  []
// newSlice: [1 2 3]
// Create an empty integer slice
islice = make([]int, 0)
// Another integer slice with 3 elements
otherSlice := []int{1, 2, 3}
// Append 'otherSlice' to 'islice'
newSlice = append(islice, otherSlice...)
newSlice = append(newSlice, otherSlice...)
// islice: []
// otherSlice: [1 2 3]
// newSlice: [1 2 3 1 2 3]

To remove elements from the beginning or the end of a...