Advanced Go: Slices continued...

Making slices

Slices are created with the make function. It works by allocating a zeroed array and returning a slice that refers to that array:

a := make([]int, 5)  // len(a)=5

To specify a capacity, pass a third argument to make:

b := make([]int, 0, 5) // len(b)=0, cap(b)=5

b = b[:cap(b)] // len(b)=5, cap(b)=5
b = b[1:]      // len(b)=4, cap(b)=4

Nil slices

The zero value of a slice is nil.

A nil slice has a length and capacity of 0.

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