randomness

Description:

randomness

Random strings, numbers. RNG with weights. Cryptographically secure options.
Getting started #
Add randomness: ^0.1.0 to pubspec.yaml and paste
import 'package:randomness/randomness.dart';
Usage #
Random Numbers #
The following are equivalent to Random().nextInt(5). The Sets include and exclude can have points, or intervals with square brackets.
Randomness.randomInt(include: {0,1,2,3,4})
Randomness.randomInt(include: {[0,4]})
Randomness.randomInt(include: {0,1,[2,4]})
Randomness.randomInt(include: {[0,100]}, exclude: {5,[6,100]})
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default is 1 to 1000 inclusive:
Randomness.randomInt()
//681
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Cryptographically secure #
1 through 100 inclusive, cryptographically secure:
Randomness.randomInt(include: {[1,100]}, cryptographicallySecure: true)
//30
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random double, cryptographically secure:
Randomness.randomDouble(min: -3, max: -1, cryptographicallySecure: true)
//-1.7392379311552753
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Weighted probability #
Give weights. 2/3 chance of 0, 1/3 chance of 1, 2, 3, or 4:
Randomness.randomInt(include: {0,1,2,3,4}, weights: {0: 2, everythingElse: 1})
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Ignores included elements not in weights. This will always give 0:
Randomness.randomInt(include: {0,1,2,3,4}, weights: {0:1})
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Random Strings #
Default length is 10. Default doesn't generate spaces:
Randomness.randomString()
/*
-((f)4$=r4
*/
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Strings include numbers, uppercase, lowercase, symbols, and spaces. This will generate numbers and spaces.
Randomness.randomString(length: 100, includeSpaces: true, excludeSymbols: true, excludeUppercase: true, excludeLowercase: true)
//3828 5491 304 0065273406 9 54745452 657207928 4469 078258338317555697369931555479 28159170 32561895
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cryptographically secure String with half A's:
Randomness.randomString(length: 50, cryptographicallySecure: true, weights: {'A': 1, everythingElse: 1})
//ACAAAAAABAAAp3litAAAAAAwAAAAAAl$AEe4IAAtAA*A#)AA6[
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random element from List, weights may not work with certain data types:
Randomness.randomFromList([{1,2}, 'a', 3], weights: {'a': 1, everythingElse: 1}, cryptographicallySecure: true)
//a
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Random n-digit number. Returns a String since parsing would ignore
0's at the beginning, and cannot parse very large integers.
The following gives average of half 4's, half 5, 6, 7, 8, or 9:
Randomness.randomNDigits(numberOfDigits: 100, excludeDigits: {0,1,2,3}, weights: {4:1, everythingElse:1})
//4944445978444496449444486964474547474444767454648456444448886854446774444444648654448475857444494895
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