dart:math

Random class

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])

factory

Creates a random number generator.

Random.secure()

factory

Creates a cryptographically secure random number generator.

Properties

hashCode → int

read-only, inherited

The hash code for this object.

runtimeType → Type

read-only, inherited

A representation of the runtime type of the object.

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

inherited

Invoked when a non-existent method or property is accessed.

toString() → String

inherited

A string representation of this object.

Operators

operator ==(Object other) → bool

inherited

The equality operator.