replace
len(s) == 0 with s == ""132
133// IntervalString converts a sign and string into a number of seconds
134func parseInterval(s string, defaultSign int) (int64, error) {
135 if len(s) == 0 {136 return 0, nil
137 }
138 sign := defaultSign
Description
It is not recommended to use len for empty string test.
A string can be tested for its emptiness either by treating it as a slice and calculating the length of the slice, or by treating it as a string and directly comparing the value. While both produce identical code when compiled, it makes more sense to treat a string as itself, than a slice, for the sake of comparison of values.
Bad practice
len(s) == 0
Recommended
s == ""
The recommended practice is considered more idiomatic in Go.