nil slices vs non-nil slices vs empty slices in Go language

Question

I am a newbee to Go programming. I have read in go programming book that slice consists of three things: a pointer to an array, length and capacity.

I am getting con

Answer 1

var s1 []int         // nil slice
s2 := []int{}        // non-nil, empty slice
s3 := make([]int, 0) // non-nil, empty slice

warning, if dealing with JSON, a nil slice will encode to null instead of [], which can break some (javascript) clients that try to iterate (without a null check) over null which isn't iterable.