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50 lines
1.2 KiB
50 lines
1.2 KiB
var getTag = require('./_getTag'),
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isArrayLike = require('./isArrayLike'),
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isObjectLike = require('./isObjectLike'),
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isString = require('./isString'),
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keys = require('./keys'),
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stringSize = require('./_stringSize');
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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} 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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var result = collection.length;
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return (result && isString(collection)) ? stringSize(collection) : result;
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}
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if (isObjectLike(collection)) {
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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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}
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return keys(collection).length;
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}
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module.exports = size;
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