Slices can be created with the built-in make function; this is how you create dynamically-sized arrays.

The make function allocates a zeroed array and returns a slice that refers to that array:

1a := make([]int, 5) // len(a) = 5

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

1b := make([]int, 0, 5) // len(b) = 0, cap(b)=5
2
3b = b[:cap(b)] // len(b)=5, cap(b)=5
4b = b[1:] // len(b)=4, cap(b)=4

References

• go-slices-length-and-capacity
• slice-zero-value
• go-slices