decimal.js
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decimal.js | proposal-slice-notation | |
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22 | 2 | |
6,113 | 518 | |
- | 0.6% | |
0.0 | 0.0 | |
8 months ago | 5 months ago | |
JavaScript | HTML | |
MIT License | MIT License |
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decimal.js
- Floats Are Weird
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Decoding Why 0.6 + 0.3 = 0.8999999999999999 in JS and How to Solve?
ii) Third-Party Libraries There are various libraries like math.js, decimal.js, big.js that solve the problem. Each library functions according to its documentation. This approach is comparatively better.
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Front-End Dilemmas: Tackling Precision Problems in JavaScript with Decimal.js
Desperate for a solution, I stumbled upon Decimal.js, a JavaScript library that provides arbitrary-precision decimal arithmetic. I was intrigued, so I decided to give it a try.
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Rant - Javascript should be able to do simple f**king math by now
I too wish JS had a dedicated Decimal Type, but there is plenty of 3rd party libraries available like decimal.js
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The Last Breaking Change | JSON Schema Blog
For your particular example though, if we keep in mind that the input data to be validated is JSON-serializable, only a string could possibly accommodate the precision expected of a decimal from among the JSON-serializable JS primitives. You could use one or more regex patterns to describe the allowable permutations. The resultant schema would be cross-platform since it doesn't use custom keywords - nice! You can also use unions if you want to say that integers, NaN, and Infinity are also allowed per the docs there.
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Javascript precision with significant zeros
i've used Decimal.js to account for floating point issues in JS before. maybe this will help? I realize its not native and is a 3rd party lib - but its intent is to handle floating point issues and precision. That kinds sounds like the tree you're barking up right now. maybe it will help.
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I'm too afraid to ask
In the example provided, the name of the library is literally Decimal.js: https://mikemcl.github.io/decimal.js/
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[AskJS] Are there numeric textbox widgets with built-in support for big numbers like decimal.js?
I'm working on a project where users will enter numbers like 9,999,999,999.99999 (up to 15 digits, up to 5 of them decimal) and we are having a problem with Numbers losing precision beyond certain number of digits (a typical issue for IEEE Standard 754 Floating Point Numbers, the 0.1 + 0.2 problem). I've solved this problem in a few projects before with the help of decimal.js or bignumber,js . In those cases, we kept user-input as strings and used a few custom-made numeric textbox widgets to accommodate this. Unfortunately, those widgets were proprietary... Now I need one again, but can't find anything. Do they exist?
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Show HN: I made a web-based notepad with a built in unit calculator
Looks good! I love the idea of the embedded calculator
I noticed that it doesn't handle remainder/modulo (%) equations:
"10 % 2" results in: "Left hand side of addition cannot be a percentage."
It does look like decimal.js can handle that: https://mikemcl.github.io/decimal.js/#mod
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
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[AskJS] How do you deal with floats in production apps?
https://github.com/MikeMcl/decimal.js/ great library
proposal-slice-notation
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HypeScript: Simplified TypeScript's type system in TypeScript's own type system
> Switch statements
JS has had switch statements for a long time. Do you mean switch "expressions" that can be used inline? It's not pretty but JS has long supported that too using either eval() "hacks" or IIFEs: https://stackoverflow.com/questions/32451049/is-eval-the-onl...
Do you mean pattern matching? There are two Stage 1 TC39 proposals with different approaches to it:
More hands-on/direct: https://github.com/tc39/proposal-pattern-matching
More indirect: https://github.com/tc39/proposal-do-expressions
> list comprehensions
There are several libraries with strong Iterator support today that while not syntactically gorgeous do great jobs at allowing you to write simple list operations. Off the top of my head are IxJS and iter-tools, but also classic mainstays like up to date versions of lodash and Ramda.
There's a Stage 2 proposal to bring more of them into "the standard library": https://github.com/tc39/proposal-iterator-helpers
There's also a Stage 2 proposal for an operator to make the syntax generally nicer no matter the library: https://github.com/tc39/proposal-pipeline-operator
> array slicing
Array.prototype.slice() was added back in ES2015: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
Array.prototype.at() was "just added" in ES2022 for unary "slice" (ability to use negative indexes): https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...
If you prefer syntax to function calls, there's a Stage 1 proposal still live for that: https://github.com/tc39/proposal-slice-notation
> better equality operators
That ship has probably sailed. Most projects at this point just have linter rules to standardize everything to the more reliable "triple equals" (===, and !==).
There are proposals for more structural equality functions in the standard library, though, for instance: https://github.com/tc39/proposal-array-equality
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JavaScript Is Weird
Both are stage 1 proposals that I hope get in there some day.
https://github.com/tc39/proposal-slice-notation
https://github.com/tc39/proposal-pattern-matching
What are some alternatives?
mathjs - An extensive math library for JavaScript and Node.js
Super-Template-Tetris - Tetris as a C++ Template Metaprogram
bigint-money - A Money class for high precision calculations using the ESnext bigint type.
V7 - Embedded JavaScript engine for C/C++
0.30000000000000004 - Floating Point Math Examples
proposal-array-equality - Determining Array Equality
liveCalc - having fun with arithmetic
coffeescript - Unfancy JavaScript
Brick\Math - Arbitrary-precision arithmetic library for PHP
devtools-detect - Detect if DevTools is open and its orientation
eslint-plugin-big-number-rules - Enforce (or automatically fix) finance-safe calculations using BigNumber or similar libraries.
proposal-pattern-matching - Pattern matching syntax for ECMAScript