## API

Calculate // Main Class

• static Map<String, Function> funs 定义的方法映射

• static List

把字符串中的数字和算式符号提取为list
Extract numbers and operators from the string into a list

• static List

把数字和算式符号列表中重复的符号去除
Remove redundant operators from list

• static num LinierCalculate

直接计算字符串式算式
Calculate directly from string

• static num ListCalculate

计算list式算式
Calculate for list

• static num plus

加法
plus

• static num substract

减法
minus

• static num multiply

乘法
multiply

• static num divide

除法
divide

• static num percent

消费或者百分式算法
percentage

## 安装 Installation

``````dependencies:
string_num_calculate: ^0.0.1
``````

## 用法说明 Usage

``````import 'package:string_num_calculate/string_num_calculate.dart';// 引入

Calculate.plus(1, 2);//=>3
Calculate.substract(1, 2);//=>-1
Calculate.multiply(1, 2);//=>2
Calculate.divide(1, 2);//=>.5
Calculate.percent(1, 2);//=>0.02
Calculate.ListCalculate(['1', '-', '5']);//=>-4
Calculate.toNumberList('1-5');//=>['1','-','5']
Calculate.formatList(['1', '+', '-', '5']);//=>['1','-','5']
Calculate.LinierCalculate('1+3+5');//=>9
``````

## 测试

``````// 加法计算 Plus
test('static [plus]计算加', () {
expect(Calculate.plus(1, 2), 3);
expect(Calculate.plus(1, -2), -1);
expect(Calculate.plus(-1, -2), -3);
expect(Calculate.plus(-.1, -2), -2.1);
expect(Calculate.plus(-.1, -0.2), -0.30000000000000004);
});
// 减法计算 Minus
test('static [substract]计算减', () {
expect(Calculate.substract(1, 2), -1);
expect(Calculate.substract(.1, -2), 2.1);
expect(Calculate.substract(0.1, -2), 2.1);
});
// 乘法计算 Multiply
test('static [multiply]计算乘', () {
expect(Calculate.multiply(1, 2), 2);
expect(Calculate.multiply(1, -2), -2);
expect(Calculate.multiply(1, 0), 0);
});
// 除法计算 Divide
test('static [divide]计算除', () {
expect(Calculate.divide(1, 2), .5);
expect(Calculate.divide(1, -2), -.5);
});
// 小费计算 Tips
test('static [percent]计算百分数', () {
expect(Calculate.percent(1, 2), 0.02);
expect(Calculate.percent(1, -2), -0.02);
expect(Calculate.percent(100, 2), 2);
});

// 数字list计算 Calculate for list
test('static [ListCalculate]数字list计算', () {
expect(Calculate.ListCalculate(['1', '-', '5']), -4);
expect(Calculate.ListCalculate(['1', '+', '5']), 6);
expect(Calculate.ListCalculate(['-1', '×', '5']), -5);
expect(Calculate.ListCalculate(['1', '%', '5']), 0.05);
});
// 数字字符串转换成数字list Convert from string to list
test('static [toNumberList]数字字符串转list', () {
expect(Calculate.toNumberList('1-5'), ['1', '-', '5']);
expect(Calculate.toNumberList('-1+5'), ['-','1', '+', '5']);
expect(Calculate.toNumberList('1×5'), ['1', '×', '5']);
expect(Calculate.toNumberList('1%5'), ['1', '%', '5']);
});
// 数字list去除符号相同 Remove redundant operators from list
test('static [formatList]数字字符串转list', () {
expect(Calculate.formatList(['1', '+', '-', '5']), ['1', '-', '5']);
expect(Calculate.formatList(['1', '+', '+', '5']), ['1', '+', '5']);
expect(Calculate.formatList(['1', '+', '×', '5']), ['1', '×', '5']);
expect(Calculate.formatList(['1', '+', '%', '5']), ['1', '%', '5']);
});
// 字符串计算 Calculate from string
test('Calculate->[LinierCalculate]计算一个字符串计算', () {
expect(Calculate.LinierCalculate('1+.3+5'), 6.3);
expect(Calculate.LinierCalculate('-1+0.3+5'), 4.3);
expect(Calculate.LinierCalculate('-1*3+5'), 2);
expect(Calculate.LinierCalculate('-1/2+5'), 4.5);
});
``````

## Libraries

string_num_calculate