@hkh12/node-calc
v4.2.1
Published
A small, fast, zero-dependency library/CLI to help you parse and calculate basic math expressions.
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Readme
node-calc
A small, fast, zero-dependency library/CLI to help you parse and calculate basic math expressions. It supports +, -, *, / and ^ operators, parenthesis, and functions such as:
- Trigonometric functions: sin, cos, tan, cot
- sqrt, cbrt
- Factorial: x! (or fact(x))
- abs
- log (base 10), ln
Functions are written in the form of
f(x)
,fx
syntax is not supported yet!
Installation
npm i @hkh12/node-calc
Examples
const { evalExpression, tokenize, Token, evalTokens } = require('@hkh12/node-calc');
evalExpression('2*2') // 4
const tokens = tokenize('2*2') // -> Token[]
evalTokens(tokens); // 4
CLI
Once installed, you can node-calc
in your terminal:
# node-calc [expr...]
node-calc "2*2" "2+2" "1*3" # always wrap your expressions in quotes
node-calc # prompts you