deep search key accumulate

deepsearch-get-keys.js

function deepsearch_get_keys(haystack, bucket = []) {
  
  let i = 0;
  let p;
  
  if (Object.prototype.toString.call(haystack) === '[object Array]') {
    for (i; i < haystack.length; i++)
      ds(haystack[i], bucket);
  }
  
  else if (Object.prototype.toString.call(haystack) === '[object Object]') {
    for (p in haystack) {
      bucket.push(p);
      ds(haystack[p], bucket);
    }
  }
  
  return bucket;
  
};

deepsearch-get-keys.spec.js

var fixture = {
  a: [
    {
      a: 'a',
      b: 'b',
      ldkfj: 'flk',
      fkj: 34545
    },
    {
      fd: 454
    }
  ],
  b: 4546,
  tklsd: 34546,
  kg: 436754,
  et: {
    fjk: 325,
    fkldj: 235,
    joi: 65,
    fksdjfl: [1, 2, 3, 5435, 6546],
    fd: false
  }
};

var result = deepsearch_get_keys(test);

console.log(result.length === 15, 'should have 15 keys');
console.log(result.indexOf('fd') > -1, 'should have fd key');
console.log(result.indexOf('bloohofhho') > -1, 'should not have random key');