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lodash.size

Gets the size of collections by returning the length for array-like values or the number of own enumerable properties for objects. This is a modularized build of lodash's _.size method, exported as a standalone Node.js module.

Package Information

  • Package Name: lodash.size
  • Package Type: npm
  • Language: JavaScript
  • Installation: npm install lodash.size

Core Imports

var size = require('lodash.size');

For modern environments supporting ES modules:

import size from 'lodash.size';

Basic Usage

var size = require('lodash.size');

// Array size
size([1, 2, 3]);
// => 3

// Object size (number of own enumerable properties)
size({ 'a': 1, 'b': 2 });
// => 2

// String size
size('pebbles');
// => 7

// Null/undefined handling
size(null);
// => 0

size(undefined);
// => 0

// Empty values
size([]);
// => 0

size({});
// => 0

size('');
// => 0

Capabilities

Size Calculation

Gets the size of a collection by returning its length for array-like values or the number of own enumerable properties for objects.

/**
 * Gets the size of collection by returning its length for array-like
 * values or the number of own enumerable properties for objects.
 *
 * @param {Array|Object|string} collection The collection to inspect.
 * @returns {number} Returns the size of collection.
 */
function size(collection)

Parameters:

  • collection (Array|Object|string): The collection to inspect

Returns:

  • (number): The size of collection

Behavior:

  • For arrays and array-like objects (with numeric length property): returns the length value
  • For objects: returns the count of own enumerable properties (uses lodash.keys internally)
  • For strings: returns the string length
  • For null or undefined: returns 0
  • For values with invalid length properties: falls back to counting object properties

Examples:

// Arrays
size([1, 2, 3, 4, 5]);
// => 5

// Array-like objects
size({ 0: 'a', 1: 'b', 2: 'c', length: 3 });
// => 3

// Plain objects
size({ foo: 'bar', baz: 'qux' });
// => 2

// Strings
size('hello world');
// => 11

// Edge cases
size(null);          // => 0
size(undefined);     // => 0
size([]);           // => 0
size({});           // => 0
size('');           // => 0

// Objects with length property that isn't valid
size({ length: 'invalid', a: 1, b: 2 });
// => 2 (counts properties, ignores invalid length)