Slices in Go are used where most languages would use arrays as they are a growable sequence of values of the same type.
Memory used by slice is provided by an fixed size array. A slice is a view into that array.
Slice has a length and capacity.
Capacity represents how many total elements a slice can have. That’s the size of underlying array.
Length is the current number of elements in the slice.
The difference between capacity and length is how many elements we can append to a slice before we have to re-allocate underlying array.
Zero value of a slice is nil.
Basic of slices:
slice := make(int, 0, 5) // append element to end of slice slice = append(slice, 5) // append multiple elements to end slice = append(slice, 3, 4) fmt.Printf("length of slice is: %d\n", len(slice)) fmt.Printf("capacity of slice is: %d\n", cap(slice))
length of slice is: 3 capacity of slice is: 5