num_utilities #

A collection of extension methods for [num]s, [int]s, and [double]s; and iterables of [num]s, [int]s, and [double]s.

See: list_utilities

Usage #

import 'package:num_utilities/num_utilities.dart';

Numbers #

[num]s, [int]s, and [double]s were extended with the following methods/getters:

isPositive #

[isPositive] returns true if the number's sign is positive.

final numA = 5;
print(numA.isPositive); // true

final numB = -5;
print(numB.isPositive); // false

equals #

[equals] is equivalent to the == operator, but has an optional parameter to round the numbers before comparing them, by calling [roundTo] (see below.)

final numA = 5.556;
final numB = 5.557;
print(numA.equals(numB)); // false
print(numA.equals(numB, 100)); // true

roundTo #

[roundTo] rounds the number by the value: (number * value).round() / value

final number = 5.556;
print(number.roundTo(10)); // 5.6

roundToPrecision #

[roundToPrecision] rounds the number to the specified number of decimal points.

final number = 5.5567893;
print(number.roundToPrecision(3)); // 5.557

Iterables #

Iterables of [num]s, [int]s, and [double]s were extended with the following methods:

sum #

The [sum] method returns the sum of all of the values in the iterable.

final list = [1, 2, 3, 4, 5];
print(list.sum()); // 15

absSum #

The [absSum] method returns the sum of all of the absolute values in the iterable.

[absSum] has an optional parameter to invert the returned value.

final list = [1, -2, 3, -4, 5];
print(list.absSum()); // 15
print(list.absSum(false)); // 15
print(list.absSum(true)); // -15
print(list.sum()); // 3

highest #

The [highest] getter returns the highest value in the iterable.

final list = [1, 2, 3, 4, 5];
print(list.highest); // 5

lowest #

The [lowest] getter returns the lowest value in the iterable.

final list = [1, 2, 3, 4, 5];
print(list.lowest); // 1