potence

Table of contents

• What is potence?
• Why would you use potence?
  • potence is tiny and has no dependencies
  • Open to contributions and improvements
  • Full TypeScript integration
• Docs
• Usage
  • Installation
  • Submodule imports
  • Main entry imports
• Contribution Guidelines

What is potence?

potence is a tiny modularized JavaScript library containing a variety of convenience functions related to common data types like strings, numbers, objects, or arrays. Unfortunately, JavaScript lacks a comprehensive standard library, which is why implementing seemingly basic functionality can sometimes be quite a hassle. You often find yourself writing the same utility functions over and over in different projects.

potence takes that job out of your hands and provides you with all the functions that you'd expect any mature language to have intrinsically and more.

Why would you use potence?

potence is tiny and has no dependencies

All functionality in potence is completely implemented in native JavaScript. While potence does sport quite a few functions, its modular nature allows for tree-shaking, so you only pay for what you actually use, drastically reducing overall bundle size.

Full test coverage

All available functions are supported by unit tests. Even the utility types offered to TypeScript users have full test coverage thanks to ts-morph.

Open to contributions and improvements

The modularity of modern JavaScript build systems allows us to add an infinite number of new functions and modules without impacting the final bundle size at all. As such, potence constantly strives to add more common functionality and eliminate potential bugs. For this it relies on user feedback, so don't be afraid to open an issue on github if you notice a bug or have an idea for an improvement! Be sure to read the contribution guidelines below if you have a feature request.

Full TypeScript integration

potence is built entirely on TypeScript. You don't have to use TypeScript to use potence, of course, but if you do you'll be able to benefit from full type coverage. potence even offers some utility types to represent things like abstract constructors, instantiable constructors, or object literals.

Docs

Click here for the full documentation.

Currently there are nine modules contained in this library:

Module	Description
Arrays	Array comparisons and common functions like Arrays.next([8, 1, -5], 2) => 8 Arrays.last([3, 6]) => 6 Arrays.replace([3, 6], 6, 9) => [3, 9]
List	A class that extends Array to get all the functions in the Arrays module on the type itself. list.groupBy(x => x.type) => [[...]] new List(1, 2, 3).intersection([3, 4, 5]) => [3]
Assert	Simple assertions with an optional configurable failure message. Examples: Assert.notNull(variable) Assert.that(number > 0, 'number was negative') Assert.every(array, item => typeof item === 'string')
Flags	Utilities that make working with flag-type enums easier. Examples: Flags.has(flags, Flag.MyFlag) => true
Fluent	WIP. Fluent API. Examples: is(value).oneOf(Enum.One, Enum.Two, Enum.Four) => true
Numbers	Accurate floating point comparisons, versioning, ranges, integer/float checks, and various mathematical complements to Math. Examples: Numbers.compare(0, 0.00000001) => true Numbers.range(0, 20).relative(5) => 0.25 Numbers.sum(2, 4, 8) => 14
Objects	Deep object comparisons, object schema checks, and much more. Objects.compare({ a: 1 }, { a: 1 }) => true Objects.isObjectLiteral(new Date()) => false Objects.structure({ a: 1 }, { a: 'number' }) => true
Strings	String checks and manipulations such as URL checking like Strings.strip('banana bear', 'na', ' ') => 'babear' Strings.takeUntil('myGroup:myValue', ':') => 'myGroup'
Types	Convenience types for TypeScript users. Nullable<string> // string | null | undefined Constructor<BaseClass> // denotes abstract constructor Instantiable<BaseClass> // denotes "newable" constructor

You may also wish to take a look at the unit tests for more complete examples.

Usage

Installation

Simply run

npm install potence

or

yarn install potence

Submodule imports

The way you import and use potence is up to you. You can use submodule imports:

import * as Arrays from 'potence/arrays';

Arrays.equal([1, 2, 3], [1, 2, 3]); // true

Since potence offers utility functions for each major data type, this allows you to immediately identify which data type a set of functions belongs to and get code suggestions only for that type. It also prevents name clashes between modules.

Main entry imports

Alternatively, you can simply import from the main module entry. This will also allow you to capitalize on your IDE's or code editor's import completion. However, you won't be able to use non-namespaced modules this way:

import { Arrays } from 'potence';

Arrays.equal([1, 2, 3], [1, 2, 3]); // true

Note for webpack users: It is strongly recommended that you migrate to webpack 5 if you'd like to use main module imports. This is because webpack 4 does not support tree-shaking for re-exported modules, which means that, in this example, all Arrays functions would be added to your bundle despite the fact you only use Arrays.equal(). webpack 5 only ever bundles the functions you actually use.

Contribution Guidelines

To maintain potence's original paradigms, there are a series of guidelines you should read and keep if you'd like to contribute to the project:

• Size. Using any given potence function should not increase the resulting build size by a large margin. To ensure that it doesn't, functions must be kept as small as possible. If your idea does not fit a single function, consider creating a standalone package for it.
• Generalization. All functions must be kept as generalized as possible to ensure that a wide variety of projects can use them in their code base and to avoid bloating potence. A function tailored for a very specific use case may not be suitable for potence. When in doubt, open an issue and we can discuss the idea together.
• Function number. To ensure a good developing experience, there should a) not be too many modules and b) not be too many functions per module so as to not bloat the IDE's code completion lists and make it harder for the user to find the function they need.
• Documentation. Each module and function must be thoroughly documented. Any user should be able to understand what the function does without any prior knowledge aside from JavaScript basics. Include examples if the usage is unclear. Only relevant on pull requests.
• Tests. Functions without 100% line coverage will not be accepted. Only relevant on pull requests.