IPFix

Infix to postfix notation transformer for simple mathematical operations. Also a simple postfix calculator.

Supported operations:

• Addition (+)
• Subtraction (-)
• Multiplication (*)
• Division (/)
• Pow (^)

Installation

npm install ipfix

Examples

const ipfix = require("ipfix");
 
/*
 *
 * Transformation
 *
 */
 
const example1 = ipfix.transform('1+1');
// example1 = '1 1 +'
 
const example2 = ipfix.transform('14+2^2');
// example2 = '14 2 2 ^ +'
 
const example3 = ipfix.transform('(11+2*37.7)/(2-1)');
// example3 = '11 2 37.7 * + 2 1 - /'
 
const example4 = ipfix.transform('(1+253)^2');
// example4 = '1 253 + 2 ^'
 
/*
 *
 * Evaluation
 *
 */
 
const example5 = ipfix.calculate('1 2 3 * 2 / + 1 -');
// example5 = '3'
 
const example6 = ipfix.calculate('11 2.5 37 * + 2 1 - /');
// example6 = '103.5'
 
const example7 = ipfix.calculate('1.75 253 + 2 ^');
// example7 = '64897.5625'
 
const example8 = ipfix.calculate('1 25 3 * +');
// example8 = '76'
 

API

calculate(expression)

Evaluates a postfix expression and returns the result.

Example:

ipfix.calculate('1 22 3 * +') // 67

transform(expression)

Transforms an infix expression into a postfix expression.

Example:

ipfix.transform('1+22*3') // 1 22 3 * +

License

MIT - James Kolce