As explained in the rand 0.5.0 docs, gen_ascii_chars is deprecated and you should use sample_iter(&Alphanumeric) instead. use rand::{distributions::Alphanumeric, Rng}; // 0.8 fn main() { let s: String = rand::thread_rng() .sample_iter(&Alphanumeric) .take(7) .map(char::from) .collect(); println!(“{}”, s); }
Depending on your use case, another option is the math/rand package. Don’t do this if you’re generating numbers that need to be completely unpredictable. It can be helpful if you need to get results that are reproducible, though — just pass in the same seed you passed in the first time. Here’s the classic “seed … Read more
Don’t generate random strings with vowels and then you don’t have to worry about curse words.
Mac OS X’s “Keychain Access” application gives you access to the nice OS X password generator. Hit command-N and click the key icon. You get to choose password style (memorable, numeric, alphanumeric, random, FIPS-181) and choose the length. It also warns you about weak passwords.
There is also this algorithm: Oh, and more seriously: Random number generators use mathematical formulas that transfer set of numbers to another one. If, for example, you take a constant number N and another number n_0, and then take the value of n mod N (the modulo operator), you will get a new number n_1, … Read more
I know it is an old question, but now it is possible to use random_score, with the following search query: { “size”: 1, “query”: { “function_score”: { “functions”: [ { “random_score”: { “seed”: “1477072619038” } } ] } } } For me it is very fast with about 2 million documents. I use current timestamp … Read more
This should be considerably faster than both answers above and supports seeding: curl -XGET ‘localhost:9200/_search’ -d ‘{ “query”: { “function_score” : { “query” : { “match_all”: {} }, “random_score” : {} } } }’; See: https://github.com/elasticsearch/elasticsearch/issues/1170
These works but probably you didn’t use the right namespace, just use the use statement at the top of your class name like this: <?php namespace SomeNamespace; use App\Quotation; // Says “Quotation.php” is in “App” folder (By default in L-5.0) class someClass { //… } Then you may use in your method something like this: … Read more
If file sizes could be specified accurate to the bit, for any file size N, there would be precisely 2^(N+1)-1 possible files of N bits or smaller. In order for a file of size X to be mapped to some smaller size Y, some file of size Y or smaller must be mapped to a … Read more
Lua indexes tables from 1, unlike C, Java etc. which indexes arrays from 0. That means, that in your table, the valid indexes are: 1, 2, 3, 4. What you are looking for is the following: print( myTable[ math.random( #myTable ) ] ) When called with one argument, math.random(n) returns a random integer from 1 … Read more