❄️A lightweight math library for JavaScript. It features a flexible expression parser comes with a large set of built-in functions and constants. Powerful and easy to use.
In active development, any pull request will be welcome :)
- Minimal and fast
- Supports numbers, complex numbers, fractions, conditions.
- Compatible with JavaScript.
- Contains a flexible expression parser.
- Dynamic creation of variables, multivalue. (Experimental)
- Comes with a large set of built-in functions and constants.
- Has no dependencies. Runs on any JavaScript engine.
- Can be used as a command line application as well. (Experimental)
- Open source.
npm install --save sylver
# or
yarn add sylver// load sylver
var sylver = require('sylver');
// basic
sylver("(3*2)+6") // 12
sylver("~16") // -16
sylver("7!") // 5040
// compare (0 = false; 1 = true)
sylver("32<>32") // 0
sylver("(10*2)<=(40+3)") // 1
sylver("11 eq 11") // 1
sylver("4<=9") // 1
// conditions
sylver("if(3+8<=23)12:3") // 12
// intervals
sylver("2 to 8") // [2, 3, 4, 5, 6, 7, 8]
sylver("(4*PI) to (23/2)") // [11.5, 12.5]
sylver("2 * (6 to 10)") // [ 12, 14, 16, 18, 20 ]
// list
sylver("[2, 3, 5, 1] * [6, 3, 5, 4, 102]") // [ 12, 9, 25, 4, 102 ]
// algebra
sylver("cos(4)") // -0.6536436208636119
sylver("atan(7)") // 1.4288992721907328
sylver("atanh(-0.4)") // -0.4236489301936018
// See: test/algebra1.js
// Other
sylver("abs(ln(2)*(4^3))*(if(3<>6) 2:5)") // 88.722839111673npm i -g sylver
# or
yarn global add sylverEnter from the command terminal:
sylver --help| Operator | Description |
|---|---|
| + | addition |
| - | subtraction |
| ∗ | multiplication |
| / | right division, i.e. x/y |
| ˆ | power, i.e. x^y |
| functions |
|---|
| log log10 log1p log2 sqrt, cos, tan, sin, atan, asin, acos, atanh, acosh, asinh |
Sylver is able to generate lists of numbers from a range:
sylver("1 to 7") // [ 1, 2, 3, 4, 5, 6, 7 ]
sylver("2 * (6 to 10)") // [12, 14, 16, 18, 20]
sylver("(1 to 4) * [2, 4, 6, 7]") // [ 2, 8, 18, 28 ]
sylver("(1 to 4) * 3") // [ 3, 6, 9, 12 ]
sylver("1 to (10/2) + 10") // [11, 12, 13, 14, 15]The order of the operators is important:
sylver("10 / [2, 5, 4]") // [5, 2, 2.5]
// This is different from:
sylver("[2, 5, 4] / 10") // [0.2, 0.5, 0.4]Evaluate expressions and returns a decision:
sylver(`if((5*2)>(6*2)) 80 : 35 `) // 35You can use the returned result to operate with other expressions:
sylver("(if(3>0)1:2)*5)") // 5Currently there are two constants available: PI, E
sylver("PI") // 3.141592653589793
sylver("E") // 2.718281828459045The creation of variables is dynamic, it is not necessary to specify the data type: Imagine that you are creating a variable in javascript but without specifying var.
A variable can contain a number or a list of numbers.
// Create a variable
sylver("var12 := ((1 to 5) * 34)")
// Get value of a variable
sylver(":var12") // [ 34, 68, 102, 136, 170 ]When you create a variable, the data that has been assigned is returned:
sylver("hello := 123") // 123
// e.g.
sylver("(bye := 5) * 2") // 10// TODO: Version for browsers in development Sylver works on any ES5 compatible JavaScript engine: node.js 0.10, and Internet Explorer 9 and newer, and all other browsers (Chrome, Firefox, Safari). If support for old browsers like Internet Explorer 8 is required, the es5-shim library has to be loaded.
First clone the project from github:
git clone https://github.com/juliandavidmr/sylver.git
cd sylverInstall the project dependencies:
npm install
# or
yarnTo execute tests for the library, install the project dependencies once:
npm installThen, the tests can be executed:
npm testThe tests are run with ava
- jison - Bison in JavaScript
Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.
We use SemVer for versioning.
- Julian David - Initial work - @juliandavidmr
See also the list of contributors who participated in this project.
This project is licensed under the MIT License - see the LICENSE file for details