This challenge corresponds to the seventh part of the Coding Challenges series by John Crickett https://codingchallenges.fyi/challenges/challenge-calculator.
The aim of the challenge is to write a calculator that can perform basic arithmetic operations on numbers (floating point numbers are also supported). The calculator supports the following operators:
+: Addition-: Subtraction*: Multiplication/: Division^: Exponentiation
The calculator also support parentheses ( and ) to group operations.
No support for functions such as sin or cos is currently provided.
IMP: The input string should have operators and operands always separated by a space.
The calculator first converts the input string into a postfix expression using Shunting Yard algorithm, and then evaluates the expression to get the result. It will throw an Error if the input string is invalid.
You can directly import the Calculator class from the calculator.ts file and use it in your code as follows:
import { Calculator } from 'path/to/calculator';
const str = '1 + 1';
const value = new Calculator(str).calculate(); // value = 2You can also use the command line tool as follows:
# Using node
node /path/to/calculator.index.js '1 + 1'
# Using ts-node
npx ts-node calculator.index.ts '1 + 1'To run the tests for the Calculator tool, go to the root directory of this repository and run the following command:
npm test src/7/