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46 lines
1.1 KiB
46 lines
1.1 KiB
import baseKeys from './_baseKeys.js'; |
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import getTag from './_getTag.js'; |
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import isArrayLike from './isArrayLike.js'; |
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import isString from './isString.js'; |
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import stringSize from './_stringSize.js'; |
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/** `Object#toString` result references. */ |
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var mapTag = '[object Map]', |
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setTag = '[object Set]'; |
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/** |
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* Gets the size of `collection` by returning its length for array-like |
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* values or the number of own enumerable string keyed properties for objects. |
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* |
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* @static |
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* @memberOf _ |
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* @since 0.1.0 |
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* @category Collection |
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* @param {Array|Object|string} collection The collection to inspect. |
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* @returns {number} Returns the collection size. |
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* @example |
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* |
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* _.size([1, 2, 3]); |
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* // => 3 |
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* |
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* _.size({ 'a': 1, 'b': 2 }); |
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* // => 2 |
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* |
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* _.size('pebbles'); |
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* // => 7 |
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*/ |
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function size(collection) { |
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if (collection == null) { |
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return 0; |
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} |
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if (isArrayLike(collection)) { |
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return isString(collection) ? stringSize(collection) : collection.length; |
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} |
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var tag = getTag(collection); |
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if (tag == mapTag || tag == setTag) { |
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return collection.size; |
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} |
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return baseKeys(collection).length; |
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} |
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export default size;
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