Last change
on this file since 84d0fbb was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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[6a3a178] | 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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