Random class Null safety

A generator of random bool, int, or double values.

The default implementation supplies a stream of pseudo-random bits that are not suitable for cryptographic purposes.

Use the Random.secure constructor for cryptographic purposes.

To create a non-negative random integer uniformly distributed in the range from 0, inclusive, to max, exclusive, use nextInt(int max).

var intValue = Random().nextInt(10); // Value is >= 0 and < 10.
intValue = Random().nextInt(100) + 50; // Value is >= 50 and < 150.

To create a non-negative random floating point value uniformly distributed in the range from 0.0, inclusive, to 1.0, exclusive, use nextDouble.

var doubleValue = Random().nextDouble(); // Value is >= 0.0 and < 1.0.
doubleValue = Random().nextDouble() * 256; // Value is >= 0.0 and < 256.0.

To create a random Boolean value, use nextBool.

var boolValue = Random().nextBool(); // true or false, with equal chance.

Constructors

Random([int? seed])
Creates a random number generator.
factory
Random.secure()
Creates a cryptographically secure random number generator.
factory

Properties

hashCode int
The hash code for this object.
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

Methods

nextBool() bool
Generates a random boolean value.
nextDouble() double
Generates a non-negative random floating point value uniformly distributed in the range from 0.0, inclusive, to 1.0, exclusive.
nextInt(int max) int
Generates a non-negative random integer uniformly distributed in the range from 0, inclusive, to max, exclusive.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
toString() String
A string representation of this object.
inherited

Operators

operator ==(Object other) bool
The equality operator.
inherited