@algebroid/core

JavaScript Library for:

• Parsing infix to postfix notation.
• Calculating postfix notation.
• Or all at once: calculating string math expression.

Get Started

Supports:

• large numbers.
• Operators: + - / * % ^.

Install:

npm i @algebroid/core --save

Usage:

const {calculate} = require('@algebroid/core');
const result = calculate("123 + 222 - ( 23 * 45 / 3 ) + 2 ^ 32");

API Documentation

• calculate: function. (expression: string) => string. Calculates given string math expression and returns result. Example:

  const {calculate} = require('@algebroid/core');
  const result = calculate("1 + 2 - 300000000000000000000000");
  

• Parser: class. constructor(expression: string). Converts infix to postfix notation. Methods:

  • parse(): string[]. parses and returns array of tokens in postfix notation. Example:

  const {Parser} = require('@algebroid/core');
  const parser = new Parser("1 + 2 - 300000000000000000000000");
  const postfix = parser.parse();
  

• Calculator: class. Calculates postfix notated tokens.

  • constructor(postfixTokens: string[], EXPONENTIAL_AT = 1000000).
    • postfixTokens: string[]: array of numbers\operators. Example: ['12', '23', '+']
    • EXPONENTIAL_AT: number = 1000000. optional. Length of result at which result would be presented using exponential.
  • calculate(): string. calculates and returns result Example:

  const {Calculator} = require('@algebroid/core');
  const calculator = new Calculator(["5", "2", "*"]);
  const result = calculator.calculate();