Last change
on this file since 571e0df was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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1 | var baseKeys = require('./_baseKeys'),
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2 | getTag = require('./_getTag'),
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3 | isArrayLike = require('./isArrayLike'),
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4 | isString = require('./isString'),
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5 | stringSize = require('./_stringSize');
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6 |
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7 | /** `Object#toString` result references. */
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8 | var mapTag = '[object Map]',
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9 | setTag = '[object Set]';
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10 |
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11 | /**
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12 | * Gets the size of `collection` by returning its length for array-like
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13 | * values or the number of own enumerable string keyed properties for objects.
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14 | *
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15 | * @static
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16 | * @memberOf _
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17 | * @since 0.1.0
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18 | * @category Collection
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19 | * @param {Array|Object|string} collection The collection to inspect.
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20 | * @returns {number} Returns the collection size.
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21 | * @example
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22 | *
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23 | * _.size([1, 2, 3]);
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24 | * // => 3
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25 | *
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26 | * _.size({ 'a': 1, 'b': 2 });
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27 | * // => 2
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28 | *
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29 | * _.size('pebbles');
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30 | * // => 7
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31 | */
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32 | function size(collection) {
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33 | if (collection == null) {
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34 | return 0;
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35 | }
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36 | if (isArrayLike(collection)) {
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37 | return isString(collection) ? stringSize(collection) : collection.length;
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38 | }
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39 | var tag = getTag(collection);
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40 | if (tag == mapTag || tag == setTag) {
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41 | return collection.size;
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42 | }
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43 | return baseKeys(collection).length;
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44 | }
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45 |
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46 | module.exports = size;
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