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arrayreduce

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library2.1.0jsnpmunverified

The `arrayreduce` package, currently at version 2.1.0, provides a small collection of pre-built, reusable reducer functions designed to simplify common array reduction patterns when used with JavaScript's native `Array.prototype.reduce` method. These utilities include functions for tasks such as concatenating nested arrays, performing logical AND/OR operations across array elements, and transforming an array of objects into an indexed object based on a specified attribute. Due to its last update approximately five years ago, the package is considered abandoned, lacks active maintenance, and does not provide native ES module (ESM) support or TypeScript type definitions. It targets older Node.js environments (>=4.0.0), making it less ideal for contemporary JavaScript projects without appropriate transpilation or CJS-to-ESM bridging solutions.

npm install arrayreduce
INSTALL
IMPORT
SIG · ARRAYREDUCE
A
arrayreduce
datajavascriptv2.1.0
Install
Import
Disk
Pass rate
0/ 6
Env Coverage0 / 6
glibc
1822
musl
1822
Install & Compatibility
Where this runs
tested against v? · npm install
Install × environment matrix
Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux
musl
node 18226 runs
build_error
glibc
node 18226 runs
build_error
Code
Verified usage

Verified import paths — ran on the pinned version, not inferred.

arrayreduce
const arrayreduce = require('arrayreduce');
import arrayreduce from 'arrayreduce';
This package is a CommonJS module. Attempting to use default ES module import syntax will likely result in an error or an 'undefined' import without a CJS-ESM compatibility layer.
arrayConcat
const { arrayConcat } = require('arrayreduce');
import { arrayConcat } from 'arrayreduce';
Individual utility functions are exported as properties of the main CommonJS module. Direct named ES module imports are not supported.
indexByAttr
const { indexByAttr } = require('arrayreduce');
import { indexByAttr } from 'arrayreduce';
Access named exports via object destructuring from the `require()` call, not ES module named imports.

Demonstrates importing the module and using `indexByAttr` to create an object indexed by ID, along with a simple boolean reduction.

const arrayreduce = require('arrayreduce'); // Get a reducer function to index an array of objects by an attribute. const indexById = arrayreduce.indexByAttr('id'); // Sample data const data = [ {id: 101, name: 'Alice', age: 30}, {id: 102, name: 'Bob', age: 24}, {id: 103, name: 'Charlie', age: 35} ]; // Execute the reduction to create an indexed object const indexedResult = data.reduce(indexById, {}); console.log(indexedResult); /* Output: { '101': { id: 101, name: 'Alice', age: 30 }, '102': { id: 102, name: 'Bob', age: 24 }, '103': { id: 103, name: 'Charlie', age: 35 } } */ // Another example: Boolean AND reduction const booleanAndReducer = arrayreduce.booleanAnd(); const andResult = [true, false, true].reduce(booleanAndReducer, true); console.log('Boolean AND result:', andResult); // -> Boolean AND result: false
Debug
Known issues
breakingThis package is considered abandoned, with the last commit dating back approximately five years. There will be no further updates, bug fixes, or security patches. Projects should consider migrating to maintained alternatives or implementing similar utility functions natively.
fix
Evaluate alternatives like lodash/fp or implement custom reducer functions that suit your project's needs. If continued use is necessary, vendoring the code might be an option, but this is generally not recommended due to security and maintenance overheads.
affects: >=2.1.0
gotchaThe package is a CommonJS (CJS) module and does not natively support ES Modules (ESM) syntax. Direct `import` statements will fail in ESM-only environments or modern Node.js without specific configuration (e.g., Babel, Webpack, or a CJS-ESM bridge).
fix
Always use `const arrayreduce = require('arrayreduce');` for importing. In modern Node.js ESM projects, you might need to use dynamic `import()` or an ESM wrapper if strict ESM is enforced.
affects: >=2.0.0
gotchaNo TypeScript definitions are shipped with the package, nor are they available on DefinitelyTyped (`@types/arrayreduce`). This means TypeScript projects will infer `any` types for imported functions, losing type safety.
fix
Create a custom declaration file (e.g., `arrayreduce.d.ts`) to provide type definitions for the functions you use. Alternatively, opt for type-safe alternatives.
affects: >=2.0.0
gotchaThe `package.json` specifies `"node": ">=4.0.0"`. While this doesn't prevent it from running on newer Node.js versions, it indicates the package was developed for and tested against very old environments. It may not leverage modern JavaScript features or best practices.
fix
No direct fix is required for compatibility, but be aware that the code might not be optimized for current Node.js runtime performance or security features.
affects: >=2.0.0
Errors
Common errors & fixes
ReferenceError: require is not defined
Attempting to use `require()` in an ES module scope (e.g., in a file with `"type": "module"` in `package.json` or a `.mjs` file).
fix
Convert your file to a CommonJS module (e.g., use `.js` extension without `"type": "module"`) or use dynamic `import('arrayreduce')` and then access the default export's properties.
TypeError: arrayreduce.arrayConcat is not a function
This error typically occurs if `arrayreduce` was imported using `import arrayreduce from 'arrayreduce';` in an ESM context, which attempts to get a default export that doesn't exist, resulting in `arrayreduce` being `undefined` or an unexpected value.
fix
Ensure you are using `const arrayreduce = require('arrayreduce');` for CommonJS imports, or, if in an ESM context, dynamically import it and destructure: `const { arrayConcat } = await import('arrayreduce');`.
TS2307: Cannot find module 'arrayreduce' or its corresponding type declarations.
Using `arrayreduce` in a TypeScript project without type declarations.
fix
Create a `d.ts` file (e.g., `arrayreduce.d.ts`) in your project to declare the module and its functions, for example: `declare module 'arrayreduce' { export function arrayConcat(): Function; export function booleanAnd(): Function; export function booleanOr(): Function; export function indexByAttr(key: string): Function; }`
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Version history
2.1.0latest on npm
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Dependencies

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Resources
arrayreduce — npm install arrayreduce · libregistry