pub struct Alphanumeric;
Expand description

Sample a u8, uniformly distributed over ASCII letters and numbers: a-z, A-Z and 0-9.

Example

use rand::{Rng, thread_rng};
use rand::distributions::Alphanumeric;

let mut rng = thread_rng();
let chars: String = (0..7).map(|_| rng.sample(Alphanumeric) as char).collect();
println!("Random chars: {}", chars);

The DistString trait provides an easier method of generating a random String, and offers more efficient allocation:

use rand::distributions::{Alphanumeric, DistString};
let string = Alphanumeric.sample_string(&mut rand::thread_rng(), 16);
println!("Random string: {}", string);

Passwords

Users sometimes ask whether it is safe to use a string of random characters as a password. In principle, all RNGs in Rand implementing CryptoRng are suitable as a source of randomness for generating passwords (if they are properly seeded), but it is more conservative to only use randomness directly from the operating system via the getrandom crate, or the corresponding bindings of a crypto library.

When generating passwords or keys, it is important to consider the threat model and in some cases the memorability of the password. This is out of scope of the Rand project, and therefore we defer to the following references:

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Deserialize this value from the given Serde deserializer. Read more
Append len random chars to string
Generate a String of len random chars
Generate a random value of T, using rng as the source of randomness.
Create an iterator that generates random values of T, using rng as the source of randomness. Read more
Create a distribution of values of ‘S’ by mapping the output of Self through the closure F Read more
Serialize this value into the given Serde serializer. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.