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