bbo/es/size.js

bbo is a utility library of zero dependencies for javascript.

import './get_tag.js';
import isArray from './is_array.js';
import isString from './is_string.js';
import isMap from './is_map.js';
import isSet from './is_set.js';

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

function size(collection) {
  if (collection === null || collection === undefined) {
    return 0;
  }

  if (isArray(collection) || isString(collection)) {
    return collection.length;
  }

  if (isMap(collection) || isSet(collection)) {
    return collection.size;
  }

  return Object.keys(collection).length;
}

export default size;