tessl/npm-lodash-identity
The modern build of lodash's identity utility function exported as a standalone module.
—
Pending
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
Pending
The risk profile of this skill
Lodash Identity
Lodash Identity provides the identity utility function from the lodash library as a standalone Node.js module. The identity function is a fundamental utility that returns its first argument unchanged, making it essential for functional programming patterns, default callbacks, and placeholder operations.
Package Information
- Package Name: lodash.identity
- Package Type: npm
- Language: JavaScript
- Installation:
npm install lodash.identity
Core Imports
const identity = require('lodash.identity');ESM:
import identity from 'lodash.identity';Basic Usage
const identity = require('lodash.identity');
// Basic usage - returns the input unchanged
const value = identity(42);
console.log(value); // => 42
const object = { a: 1, b: 2 };
console.log(identity(object) === object); // => true
// Common usage as a default callback
const users = [
{ name: 'Alice', active: true },
{ name: 'Bob', active: false },
{ name: 'Charlie', active: true }
];
// Use as default transformation function - filter truthy values
const activeUsers = users.filter(user => user.active);
// Use in array operations where no transformation is needed
const numbers = [1, 2, 3];
const sameNumbers = numbers.map(identity);
console.log(numbers === sameNumbers); // => false (different array, same values)Capabilities
Identity Function
Returns the first argument it receives unchanged. This function is commonly used as a default transformation function in functional programming patterns and as a placeholder when no transformation is needed.
/**
* This method returns the first argument it receives.
*
* @param {*} value - Any value of any type
* @returns {*} Returns the input value unchanged
* @since 0.1.0
*/
function identity(value);Parameters:
value(*): Any value - can be any JavaScript type including primitives, objects, arrays, functions, etc.
Returns:
- (*): Returns the exact same value that was passed in, with no modifications
Usage Examples:
const identity = require('lodash.identity');
// With primitives
identity(1); // => 1
identity('hello'); // => 'hello'
identity(true); // => true
// With objects (returns same reference)
const obj = { name: 'test' };
identity(obj) === obj; // => true
// With arrays (returns same reference)
const arr = [1, 2, 3];
identity(arr) === arr; // => true
// With functions
const fn = () => 'hello';
identity(fn) === fn; // => true
// Common functional programming patterns
const data = [1, 2, 3];
// As a default callback
const transformed = data.map(identity); // [1, 2, 3]
// In filter operations (truthy values)
const values = [1, 0, 'hello', '', true, false];
const truthyValues = values.filter(identity); // [1, 'hello', true]
// As a default transformation in higher-order functions
function processData(data, transform = identity) {
return data.map(transform);
}
processData([1, 2, 3]); // [1, 2, 3] (no transformation)
processData([1, 2, 3], x => x * 2); // [2, 4, 6] (with transformation)Typical Use Cases:
- Default callback function: When a function accepts an optional transformation callback
- Functional composition: As a neutral element in function composition
- Array operations: When you need to maintain array structure without transformation
- Filter operations: To filter truthy values from arrays
- Placeholder function: When an API requires a function but no operation is needed
- Type preservation: In generic functions where the input type should be preserved
- Workspace
- tessl
- Visibility
- Public
- Created
- Last updated
- Describes
- Publish Source
- CLI
- Badge
