calculator

@algorithm.ts/calculator

A tiny calculator for number arithmetics such as +-*/().

Install

• npm

  npm install --save @algorithm.ts/calculator

• yarn

  yarn add @algorithm.ts/calculator

Usage

// Perform integer arithmetics.
import calculator from 'algorithm.ts/calculator'
// or
import { calculator } from 'algorithm.ts/calculator'

// Perform decimal arithmetics.
import { decimalCalculator } from 'algorithm.ts/calculator'

// Perform bigint arithmetics.
import { bigintCalculator } from 'algorithm.ts/calculator'

Examples

• integer arithmetics

  import calculator from '@algorithm.ts/calculator'
  
  calculator.calculate('3/2')                  // => 1
  calculator.calculate('-2+1')                 // => -1
  calculator.calculate('-2*3 + 2*5*3/6')       // => -1
  calculator.calculate('(1+(4+5+2)-3)+(6+8)')  // => 23

• decimal arithmetics

  import { decimalCalculator as calculator } from '@algorithm.ts/calculator'
  
  calculator.calculate('3/2')                  // => 1.5
  calculator.calculate('-2+1')                 // => -1
  calculator.calculate('-2*3 + 2*5*3/6')       // => -1
  calculator.calculate('(1+(4+5+2)-3)+(6+8)')  // => 23

• bigint arithmetics

  import { bigintCalculator as calculator } from '@algorithm.ts/calculator'
  
  calculator.calculate('22222222222222222222222222222 * 3333333333333333333323232')
  // => 74074074074074074073849599999259259259259259259261504n

• Illegal inputs

  import calculator from '@algorithm.ts/calculator'
  
  calculator.calculate('-2++1')      // => SyntaxError
  calculator.calculate('-2*/23')     // => SyntaxError
  calculator.calculate('1+(4+5+2))') // => SyntaxError
  calculator.calculate('1+(4+5+2')   // => SyntaxError

• A solution of https://leetcode.com/problems/basic-calculator/

  import calculator from '@algorithm.ts/calculator'
  export function calculate(expression: string): number {
    return calculator.calculate(expression)
  }

• A solution of https://leetcode.com/problems/basic-calculator-ii/

  import calculator from '@algorithm.ts/calculator'
  export function calculate(expression: string): number {
    return calculator.calculate(expression)
  }

Related

• 编译原理-语法制导翻译实现计算器