Go Slices
External
Internal
Overview
A slice is a descriptor, or a header, for a contiguous segment of an underlying array, stored separately from the slice variable, and provides access to a numbered sequence of elements from that array. A slice type denotes the set of all slices of arrays of its element type. The slice was used to be referred to as a reference type, but not anymore, "reference type" terminology was removed from Go documentation.
A slice contains a pointer to the underlying array, a length and a capacity. More details available in the structure section. A slice, once initialized, is always associated with the underlaying array that holds its elements. The slice shares storage with its array, and other slices of the same array. A distinct slice that shares the underlying array with an original slice can be created by slicing the original slice with a slice expression.
Structure
Under the covers, a slice is a structure that contains:
- a pointer to the first element of the slice, as stored in the underlying array.
- an integer length of the slice.
Slices and Pass-by-Value
Go uses pass-by-value, so when slice arguments are passed to functions, the internal fields are copied across, including the pointer to the underlying array. Therefore, the underlying array data structure is intrinsically shared in case of pass-by-value.
When the slice is passed as a function argument, the structure is copied on the function's stack, so both the function argument slice, and the