You can’t solely rely on percentages or divisions to split money because it’s not divisible to infinity. Problem is, as you charge the second half, you end up with the same result and charge a penny extra. Half is $499.995, but you can’t split a penny so you’ll likely round the result to $500. Imagine you need to bill $999.99 with a 50% downpayment. Sometimes you need to split money but percentages can’t cut it without adding or losing pennies. This inevitably ends up causing rounding issues. As you calculate more values, the imperceptible precision errors lead to larger gaps. Using floats to store monetary values is a bad idea. Because it’s a binary representation of a base 10 system, you end up with inaccurate results when you try to do math. JavaScript only has the Number type, which can be used as an integer or a double precision float. Some languages have come up with their own solutions like the BigDecimal type in Java or the decimal type in C#. Computers use a binary system, so they can’t natively represent decimal numbers. Using a decimal system has advantages, but raises a major issue when it comes to programming. For example, there are 100 cents in a dollar, being 10 to the power of 2. This means that when money has sub-units, the number of these in a main unit is a power of 10. Most contemporary currencies are either decimal or have no sub-units at all. Amount and currency can’t go without one another. Same if you want to compare them: if all you have is an amount, you can’t make an accurate comparison. It’s 10 dollars, 10 euros, 10 bitcoins… If you want to add two monetary values with different currencies, you need to convert them first. The amount part of a monetary value is only relative to another aspect: its currency. Money is nothing more than a numeric value, right? Wrong. Your first instinct when you need to represent money might be to use a Number.
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As a result, every piece of software comes up with its own way of handling money, with all the pitfalls that come with it. It’s a prevalent concept of modern societies, yet it’s not a first-class data type in any mainstream language, while things like date and time are.
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Yet, there’s no consensus around how to programmatically handle monetary values. We also increasingly rely on technology to handle ours. Banking apps, e-commerce websites, stock exchange platforms, we interact with money daily. ✅ Master the art of the most powerful testing technique for Node.js: Component tests.Money is everywhere. Nodejs-integration-test-practices-and-examples JavaScript Cucumber bdd api test framework Including a super-comprehensive best practices list and an example app (April 2022) ✅ Beyond the basics of Node.js testing. Testing Web Components with Karma, Mocha & Chai. Node.js reference CRUD application using node-postgres and PostgresSQL The Web framework for perfectionists with deadlines. Synpress is an wrapper around Cypress.io with metamask support thanks to puppeteer. :white_check_mark: The Node.js best practices list (June 2022) :x: :heavy_check_mark: zero-config test runner for simple projects Angular testing library for mocking components, directives, pipes, services and facilitating TestBed setup A Jest transformer for Svelte - compile your components before importing them into tests. When comparing currency-api and javascript-testing-best-practices you can also consider the following projects: