Lodash sampleSize method
语法：
_.sampleSize(collection, [n=1])
Gets n random elements at unique keys from collection up to the size of collection.
参数：
collection (Array|Object) − The collection to sample.
[n=1] (number) − The number of elements to sample.
输出：
(Array) − Returns the random elements.
例子：
var _ = require('lodash');
var list = [1, 2, 3, 4, 5]
var result = _.sampleSize(list);
console.log(result);
result = _.sampleSize(list, 2);
console.log(result);
Save the above program in
tester.js. Run the following command to execute this program.
命令：
输出：
