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56 lines
1.7 KiB
JavaScript
56 lines
1.7 KiB
JavaScript
/**
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* lodash 3.0.0 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var keys = require('lodash.keys');
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/**
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* Used as the [maximum length](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer)
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* of an array-like value.
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*/
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var MAX_SAFE_INTEGER = Math.pow(2, 53) - 1;
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/**
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* Checks if `value` is a valid array-like length.
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*
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* **Note:** This function is based on [`ToLength`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength).
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
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*/
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function isLength(value) {
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return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
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}
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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 properties for objects.
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*
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* @static
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* @memberOf _
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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 size of `collection`.
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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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var length = collection ? collection.length : 0;
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return isLength(length) ? length : keys(collection).length;
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}
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module.exports = size;
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