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https://github.com/akushwarrior/starfruit

A math library for Dart, similar to Guava for Java.
https://github.com/akushwarrior/starfruit

arrays collection dart math regression starfruit statistics

Last synced: about 2 months ago
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A math library for Dart, similar to Guava for Java.

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README 

        
# Starfruit



A library containing useful utilities, efficiencies, and 

abstractions to improve over the Dart SDK and dart:math. It takes heavy 

inspiration from Guava (by Google) for Java, and ports some functions from 

it. 



---



It takes time, effort, and mental power to keep this package updated, useful, and

improving. If you used or are using the package, I'd appreciate it if you could spare a few 

dollars to help me continue to do so.



[![PayPal](https://img.shields.io/static/v1?label=PayPal&message=Donate&color=blue&logo=paypal&style=for-the-badge&labelColor=black)](https://www.paypal.me/kishoredev)



---



## Classes



Note: https://pub.dev/documentation/starfruit/latest/starfruit/starfruit-library.html 

is auto-generated dartdocs. This has a more detailed rundown of every class

and method. It's impossible to list every method offered and its purpose, 

so I won't try. You **should** use the usage examples and documentation to understand

the utilities of this library. For here, I'm just offering basic details on how to 

instantiate every class.



##### StarMathUtils (mathUtils)

To use, call methods on the singleton instance mathUtils (e.g. `mathUtils.chunks([1, 2, 3, 4, 5, 6], 2)` ).



##### StarCollectionUtils (collectionUtils)

To use, call methods on the singleton instance collectionUtils (e.g. `collectionUtils.chunks([1, 2, 3, 4, 5, 6], 2)` ).



##### StarStats (`List`)

To use, collect a list of numerical input data. You can then call StarStats methods on it, because

StarStats is defined as an extension on List.



##### StarStatsXY (```Map``` of points)

To use, collect input data formatted {x1: y1, x2: y2, x3: y3, ...}. You can then call StarStatsXY methods

on it, because StarStatsXY is defined as an extension on Map.



---



## Usage Examples



##### Math Utilities:



```dart

import 'package:starfruit/starfruit.dart';



main() {

  /Round to 2 decimal places

  //Ceiling and flooring to decimal places is also available

  print('Round 3.5634 to 2 decimal places:');

  print(mathUtils.roundToDouble(3.5634, 2));

  print('');



  //Power of two check

  print('Is 8 a power of two?');

  print(mathUtils.isPowerOfTwo(8));

  print('');



  //Calculate log base 2 of 8

  print('Calculate log base 2 of 8:');

  print(mathUtils.log(2, 8));

  print('');



  //double isInteger check

  print('Is 6.0 an integer?');

  print(mathUtils.isMathematicalInteger(6.0));

  print('');



  //Calculate 5!

  print('Calculate 5 factorial:');

  print(mathUtils.factorial(5));

  print('');



  //Check if 2 is within 3 of 5

  print('Is 2 within 3 of 5?');

  print(mathUtils.fuzzyEquals(2, 5, 3));

  print('');



  //Check if 7919 is a prime number

  print('Is 7919 prime?');

  print(mathUtils.isPrime(7919));

  print('');



  //LCM of 2 and 7

  print('Calculate LCM of 2 and 7:');

  print(mathUtils.lcm(2, 7));

  print('');



  //sinh of 1 radian

  print('Calculate sinh of 1 radian:');

  print(mathUtils.sinh(1));

  print('');



  //mean of 3 and 7

  print('Calculate mean of 3 and 7:');

  print(mathUtils.mean(3,7));

  print('');



  //nCr where n = 5 and r = 2

  print('Calculate the binomial coefficient of 2 and 5:');

  print(mathUtils.combinationsOf(5, 2));

  print('');



  //nPr where n = 5 and r = 2

  print('Calculate the permutations of 5 and 2:');

  print(mathUtils.permutationsOf(5, 2));

  print('');

}

```

##### Collection Utilities:

```dart

import 'package:starfruit/starfruit.dart';



main() {

  //Separate List into chunks

  print("Separate List into chunks of 4:");

  print(cUtils.chunks([1,2,3,4,5,6,7,8], 4));

  print("");



  //Collapse List> into just List

  print("Collapse List into List:");

  print(cUtils.collapse( [[1,2,3],[4,5,6,7,8]] ));

  print("");



  //Get every nth object of list

  print("Get every 4th object:");

  print(cUtils.nth([1,2,3,4,5,6,7,8], 4));

  print("");



  //Get every n random elements of list

  print("Get 5 random elements:");

  print(cUtils.random([1,2,3,4,5,6,7,8], 5));

  print("");



  //Flip keys and values of a map

  print("Flip keys and values of a map:");

  print(cUtils.flip({1:0, 2:8, 3:4, 0:5}));

  print("");



  //Zip two Lists into a map

  print("Zip two lists into a map:");

  print(cUtils.zip([1,2,3,4], [5,6,7,8]));

  print("");



  //Unzip a map into two lists

  print("Unzip a map into two lists:");

  print(cUtils.unzip({0:1, 8:2, 4:3, 5:0}));

  print("");

}

```



##### Stats Utilities:



```dart

import 'package:starfruit/starfruit.dart';



main() {

  var stats = [1,3,4,5,12,3,4,67,8,0,22];



  //median

  print("Calculate the median:");

  print(stats.median);

  print("");



  //mean

  print("Calculate the mean:");

  print(stats.mean);

  print("");



  //mode

  print("Calculate the mode:");

  print(stats.mode);

  print("");



  //variance

  print('Calculate the variance:');

  print(stats.variance);

  print("");



  //standard deviation

  print("Calculate the standard deviation:");

  print(stats.stdDev);

  print("");



  //cardinality; number of unique elements

  print("Calculate the cardinality:");

  print(stats.cardinality);

  print("");



  //7 greatest elements

  print("Return the 7 greatest elements:");

  print(stats.topElements(7));

  print("");

}

```

##### XY (Paired) Stats Utilities:



```dart

import 'package:starfruit/starfruit.dart';



main() {

  var xystats = {2:3, 7:4, 4:6, 8:9, 1:2, 3:5, 11:14, 12:18};



  //Get correlation coefficient

  print("Calculate correlation coefficient:");

  print(xystats.corCoefficient);

  print("");



  //Get determination coefficent

  print("Calculate determination coefficient:");

  print(xystats.detCoefficient);

  print("");



  //Get adjusted determination coefficient

  print("Calculate adj. determination coefficient:");

  print(xystats.adjDetCoefficient);

  print("");



  //Get linear regression line

  print("Calculate linear regression line in form y = mx + b:");

  var lr = xystats.linReg;

  print("y = ${lr[0]}x + ${lr[1]}");

  print("");



  //Get quadratic regression line

  print("Calculate quadratic regression line in form y = ax^2 + bx + c:");

  var qdr = xystats.quadReg;

  print("y = ${qdr[0]}x^2 + ${qdr[1]}x + ${qdr[2]}");

  print("");



  //Get cubic regression line

  print("Calculate cubic regression line in form y = ax^3 + bx^2 + cx + d:");

  var cr = xystats.cubicReg;

  print("y = ${cr[0]}x^3 + ${cr[1]}x^2 + ${cr[2]}x + ${cr[3]}");

  print("");



  //Get quartic regression line

  print("Calculate quartic regression line in form y = ax^4 + bx^3 + cx^2 + dx + e:");

  var qrr = xystats.quarReg;

  print("y = ${qrr[0]}x^4 + ${qrr[1]}x^3 + ${qrr[2]}x^2 + ${qrr[3]}x + ${qrr[4]}");

  print("");

}

```



---



## Features and bugs



Please file feature requests and bugs at the [issue tracker][tracker].



[tracker]: https://github.com/AKushWarrior/starfruit/issues



---



[![Pub](https://img.shields.io/pub/v/starfruit?color=blue&label=pub&logo=Steel%20Crypt&logoColor=blue&style=for-the-badge&labelColor=black)](https://pub.dev/packages/starfruit)

[![License](https://img.shields.io/github/license/AKushWarrior/starfruit?color=blue&style=for-the-badge&labelColor=black)](https://opensource.org/licenses/lgpl-3.0.html)

[![Commits](https://img.shields.io/github/commit-activity/m/AKushWarrior/starfruit?color=blue&style=for-the-badge&labelColor=black)](https://github.com/AKushWarrior/starfruit)



###### Starfruit, a set of Dart utility libraries.

###### ©2020 Aditya Kishore

###### Licensed under the MPL 2.0 (See LICENSE)