a lightweight and precise math expression parser and evaluator for JavaScript and TypeScript
License: MIT License
A passionate full stack web developer. I love learning about new technologies and contributing to open-source
๐ญ Iโm currently working on gittz
๐ฑ Iโm currently learning Nextjs
๐ฌ Ask me about react, express
๐ซ How to reach me [email protected]
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issue template folder is named ISSUE_TEMPLAATE instead of ISSUE_TEMPLATE
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A log Node that can evaluate the log of an expression to any base. there would be a default base (2 or 10)
log(x [, base])
// where both `x` and `base` can be any valid expression already supportedA typical use case would be the following
let x = new Expression('2log(3, 10)')
x.evaluate() // 0.954242509439...the base can also be an expression
let y = new Expression('log(2, 3+2)')
y.evaluate() // 0.43067655807...No response
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add issue template for bugs to enable a detailed explanation of the bug expreienced and the expected behaviour
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there is a bug in the yml syntax of the bug.yml file inside the issue templates folder
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it would be great to have a natural log node class that can be used to evaluate expressions of the form ln(x) by the parser. a new class NaturalLog that extends the TreeNode class would be the ideal solution.
new Expression('ln(2)').evaluate() // 0.6931471805....
new Expression('ln(2ฯ)').evaluate() // 1.83787706640....No response
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In your Lexer.ts file, I believe there is a typo on Line 6. I'm guessing you mean "atan" instead of "atam"
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add a pull request template to the project for improved pull request description.
for reference:
Pull Request Template
I couldn't set the number of decimal places through only hyoka and had to do extra processing with decimal.js which requires user to install another library.
const { Expression } = require('hyoka');
const Decimal = require('decimal.js');
Expression.config({
precision: 10
});
new Decimal(new Expression('12345 + 1/3').evaluate()).toDecimalPlaces(4).toString()I think the evaluate() method can support configurting decimal places with method signatureevaluate(options?: {decimalPlaces?: number})
No response
a base config option that would be used as the default base for log expressions when the log feature gets added in #15 would be nice to have. this would make it possible to configure the base globally. This config option should also have a default value assigned in the TreeNode class.
A use case of this would be:
Expression.config({
angles: 'deg',
base: 5
});
let x = new Expression('log(2)');
x.evaluate() // 0.430676558073...No response
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