module rand import time // init initializes the default RNG. fn init() { default_rng = new_default() } pub fn string(len int) string { result := '' # #const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'; #const charactersLength = characters.length; #for (let i = 0;i < len.val;i++) #result.str += characters.charAt(Math.random() * charactersLength); return result } const ( ulid_encoding = '0123456789ABCDEFGHJKMNPQRSTVWXYZ' ) // ulid generates an Unique Lexicographically sortable IDentifier. // See https://github.com/ulid/spec . // NB: ULIDs can leak timing information, if you make them public, because // you can infer the rate at which some resource is being created, like // users or business transactions. // (https://news.ycombinator.com/item?id=14526173) pub fn ulid() string { return ulid_at_millisecond(u64(time.utc().unix_time_milli())) } // ulid_at_millisecond does the same as `ulid` but takes a custom Unix millisecond timestamp via `unix_time_milli`. pub fn ulid_at_millisecond(unix_time_milli u64) string { mut buf := []byte{cap: 27} mut t := unix_time_milli mut i := 9 for i >= 0 { buf[i] = rand.ulid_encoding[int(t & 0x1f)] t = t >> 5 i-- } mut x := default_rng.u64() i = 10 for i < 19 { buf[i] = rand.ulid_encoding[int(x & 0x1f)] x = x >> 5 i++ } x = default_rng.u64() for i < 26 { buf[i] = rand.ulid_encoding[int(x & 0x1f)] x = x >> 5 i++ } res := '' println(buf) #res.str = buf.arr.arr.map(String.fromCharCode).join('') return res } fn read_internal(mut rng PRNG, mut buf []byte) { for i in 0 .. buf.len { buf[i] = rng.byte() } }