The internals of slice
There are 3 components of slice:
a) Pointer: Points to the start position of slice in the underlying array;
b) length (type is int): the number of the valid elements of the slice;
b) capacity (type is int): the total number of slots of the slice.
Check the following code:
package main import ( "fmt" "unsafe" ) func main() { var s1 []int fmt.Println(unsafe.Sizeof(s1)) } The result is 24 on my 64-bit system (The pointer and int both occupy 8 bytes).
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