Lodash Internal Array Filter

Common errors

• TypeError: lodash._arrayfilter is not a function

  cause Attempting to call the imported module directly when it might be an object or undefined, or using wrong import syntax that doesn't resolve to the function.
  fix Ensure you are using `const arrayFilter = require('lodash._arrayfilter');` and then correctly invoking `arrayFilter(collection, predicate)`.

• SyntaxError: Cannot use import statement outside a module

  cause Using ES module `import` syntax (`import arrayFilter from 'lodash._arrayfilter';`) in a CommonJS environment or for a CommonJS-only package.
  fix Change your import statement to `const arrayFilter = require('lodash._arrayfilter');`.

Warnings

• breaking This package is a Lodash v3 internal utility. It is not compatible with Lodash v4+ APIs, which introduced significant breaking changes. Using it with a modern Lodash environment or expecting v4 behavior will likely lead to errors.
  Fix: For modern applications, use the standard `_.filter` function from the main `lodash` package (v4+) or `Array.prototype.filter` for basic array filtering. Do not mix Lodash v3 internal modules with v4+ builds.
• deprecated This package represents a specific, older modular build strategy for Lodash internals. It is effectively abandoned as a standalone module in favor of using the main `lodash` package, which offers robust tree-shaking capabilities in modern bundlers, making granular imports unnecessary.
  Fix: Migrate to using `lodash` (the main package) and rely on your bundler's tree-shaking for optimized builds. Alternatively, use native JavaScript methods like `Array.prototype.filter`.
• gotcha This module is a CommonJS-only package. Attempting to use ES module `import` syntax will result in a runtime error or build failure.
  Fix: Always use `require('lodash._arrayfilter')` for this package.
• gotcha As an internal utility, `lodash._arrayfilter` may have specific assumptions about its execution context or arguments that differ from the public `_.filter` API, especially across major Lodash versions. Direct usage might not yield expected results without deep knowledge of Lodash v3 internals.
  Fix: Refer to the Lodash v3 source code for precise usage if absolutely necessary, but it is strongly recommended to use the public `_.filter` API from the appropriate Lodash version instead.

Install

• npm install lodash._arrayfilter npm
• yarn add lodash._arrayfilter yarn
• pnpm add lodash._arrayfilter pnpm

Imports

• arrayFilter
  wrong:

  import arrayFilter from 'lodash._arrayfilter';

  correct:

  const arrayFilter = require('lodash._arrayfilter');

  This package is a CommonJS module from Lodash v3 and does not support ES module import syntax.
• arrayFilter (named)
  wrong:

  import { arrayFilter } from 'lodash._arrayfilter';

  correct:

  const arrayFilter = require('lodash._arrayfilter');

  This is a CommonJS module that exports a single function as its default. It does not use named exports.

Quickstart

Demonstrates how to import and use the internal `arrayFilter` function from this legacy Lodash v3 module using CommonJS.

const arrayFilter = require('lodash._arrayfilter');

const users = [
  { 'user': 'barney', 'age': 36, 'active': true },
  { 'user': 'fred',   'age': 40, 'active': false },
  { 'user': 'pebbles', 'age': 1, 'active': true }
];

// This is an internal utility and might have specific expectations.
// For general use, prefer Array.prototype.filter or the main lodash `_.filter` (v4+).
const activeUsers = arrayFilter(users, (user) => user.active);

console.log(activeUsers);
// Expected output:
// [ { user: 'barney', age: 36, active: true }, { user: 'pebbles', age: 1, active: true } ]