var assert = require('assert');

​

class Cache {

  constructor(capacity) {

    // do something

  }

}

​

try {

  var cache = new Cache(3);

  cache.put(1, 1);

  cache.put(2, 4);

  cache.put(3, 9);

  assert.equal(cache.get(1), 1);

​

  console.log(

    'PASSED: Initialize a cache of size 3, and run `cache.put(1, 1); cache.put(2, 4); cache.put(3, 9);`. `cache.get(1)` should return 1'

  );

} catch (err) {

  console.log(err);

}

​

try {

  cache.put(4, 16);

  assert.equal(cache.get(2), -1);

​

  console.log('PASSED: ' + '`cache.put(4, 16);` should evict key `2`');