Slices

Create a slice

A slice holds a length, capacity, and a view into an underlying array.

nums := []int{10, 20, 30}
fmt.Println(nums[0], len(nums))

Append elements

append may allocate a larger array; always keep the returned slice.

nums = append(nums, 40)
fmt.Println(nums)

Slice a slice

Sub-slices share the same backing array unless you copy.

mid := nums[1:3]
fmt.Println(mid)

Slice habits

• Prefer slices over arrays for most application code
• Check len before indexing
• Use copy when you need an independent duplicate
• Nil slices are valid and have length 0