Add simple range check test in "Sample Tests". It will be useful.

Nice kata but please state the range values in input array in the description.

I am trying to figure out on how to solve this kata. any hints guys?

I think this kata should be taged as puzzle and not as fundamentals.
It's an easy puzzle but needs knowledge on javascript.

The test case has a redundant if statement of the form:

if condition
  return true 
else  
  return false

This should be replaced by the much simpler:

return condition

Expected:
[3554,3553,3552,3551,3550,3549,3548,3547,3546,3545,3544,3543,3542,3541,3540,3539,3538,3537,3528,3536,3535,3534,3533,3532,3531,3530,3529]
instead got:
[3554,3553,3552,3551,3550,3549,3548,3547,3546,3545,3544,3543,3542,3541,3540,3539,3538,3537,____,3536,3535,3534,3533,3532,3531,3530,3529]
why 3528 is not Achilles?
3528 [ 2, 2, 2, 3, 3, 7, 7 ]
Expected:[4914,4913,4912,4911,4910,4909,4908,4907,4906,4905,4904,4903,4902,4901,4900,4899,4898,4897,4896,4895,4894,4893,4892,4891,4890,4889,4888,4887,4886,4885,4884,4883,4882,4881,4880,4879,4878,4877,4876,4875,4874,4873,4872,4871,4870,4869,4868,4867,4866,4865,4864,4863,4862,4861,4860,4859,4858,4857,4856,4855,4854,4853,4852,4851,4850,4849,4848,4847,4846,4845,4844,4843,4842,4841,4840,4839,4838,4837,4836,4835,4834,4833,4832,4831,4830,4829,4828,4827,4826,4825,4824,4823,4822,4821,4820,4819,4818,4817,4816,4815,4814,4813,4812,4811,4810,4809,4808,4807,4806,4805,4804,4803,4802,4801,4800,4799,4798,4797,4796,4795,4794,4793,4792,4791,4790,4789,4788,4787,4786,4785,4784,4783,4782,4781,4780,4779,4778,4777,4776,4775,4774,4773,4772,4771,4770,4769,4768,4767,4766,4765,4764,4763,4762,4761,4760,4759,4758,4757,4756,4755,4754,4753,4752,4751,4750,4749,4748,4747,4746,4745,4744,4743,4742,4741,4740,4739,4738,4737,4736,4735,4734,4733,4732,4731,4730,4729,4728,4727,4726,4725,4724,4723,4722,4721,4720,4719,4718,4717,4716,4608,4715,4714,4713,4712,4711,4710,4709,4708,4707,4706,4705,4704,4703,4702,4701,4700,4699,4698,4697,4696,4695,4694,4693,4692,4691,4690,4689,4688,4687,4686,4685,4684,4683,4682,4681,4680,4679,4678,4677,4676,4675,4674,4673,4672,4671,4670,4669,4668,4667,4666,4665,4664,4663,4662,4661,4660,4659,4658,4657,4656,4655,4654,4653,4652,4651,4650,4649,4648,4647,4646,4645,4644,4643,4642,4641,4640,4639,4638,4637,4636,4635,4634,4633,4632,4631,4630,4629,4628,4627,4626,4625,4624,4623,4622,4621,4620,4619,4618,4617,4616,4615,4614,4613,4612,4611,4610,4609]
instead got:[4914,4913,4912,4911,4910,4909,4908,4907,4906,4905,4904,4903,4902,4901,4900,4899,4898,4897,4896,4895,4894,4893,4892,4891,4890,4889,4888,4887,4886,4885,4884,4883,4882,4881,4880,4879,4878,4877,4876,4875,4874,4873,4872,4871,4870,4869,4868,4867,4866,4865,4864,4863,4862,4861,4860,4859,4858,4857,4856,4855,4854,4853,4852,4851,4850,4849,4848,4847,4846,4845,4844,4843,4842,4841,4840,4839,4838,4837,4836,4835,4834,4833,4832,4831,4830,4829,4828,4827,4826,4825,4824,4823,4822,4821,4820,4819,4818,4817,4816,4815,4814,4813,4812,4811,4810,4809,4808,4807,4806,4805,4804,4803,4802,4801,4800,4799,4798,4797,4796,4795,4794,4793,4792,4791,4790,4789,4788,4787,4786,4785,4784,4783,4782,4781,4780,4779,4778,4777,4776,4775,4774,4773,4772,4771,4770,4769,4768,4767,4766,4765,4764,4763,4762,4761,4760,4759,4758,4757,4756,4755,4754,4753,4752,4751,4750,4749,4748,4747,4746,4745,4744,4743,4742,4741,4740,4739,4738,4737,4736,4735,4734,4733,4732,4731,4730,4729,4728,4727,4726,4725,4724,4723,4722,4721,4720,4719,4718,4717,4716,4715,4714,4713,4712,4711,4710,4709,4708,4707,4706,4705,4704,4703,4702,4701,4700,4699,4698,4697,4696,4695,4694,4693,4692,4691,4690,4689,4688,4687,4686,4685,4684,4683,4682,4681,4680,4679,4678,4677,4676,4675,4674,4673,4672,4671,4670,4669,4668,4667,4666,4665,4664,4663,4662,4661,4660,4659,4658,4657,4656,4655,4654,4653,4652,4651,4650,4649,4648,4647,4646,4645,4644,4643,4642,4641,4640,4639,4638,4637,4636,4635,4634,4633,4632,4631,4630,4629,4628,4627,4626,4625,4624,4623,4622,4621,4620,4619,4618,4617,4616,4615,4614,4613,4612,4611,4610,4609]
why 4608 is not Achilles?
4608 [ 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3 ]
Expected:[231259,231258,231257,231256,231255,231254,231253,231252,231251,231250,231249,231248,231247,231246,231245,231244,231243,231242,231241,231240,231239,231238,231237,231236,231235,231234,231233,231232,231231,231230,231200,231229,231228,231227,231226,231225,231224,231223,231222,231221,231220,231219,231218,231217,231216,231215,231214,231213,231212,231211,231210,231209,231208,231207,231206,231205,231204,231203,231202,231201]
instead got:[231259,231258,231257,231256,231255,231254,231253,231252,231251,231250,231249,231248,231247,231246,231245,231244,231243,231242,231241,231240,231239,231238,231237,231236,231235,231234,231233,231232,231231,231230,231229,231228,231227,231226,231225,231224,231223,231222,231221,231220,231219,231218,231217,231216,231215,231214,231213,231212,231211,231210,231209,231208,231207,231206,231205,231204,231203,231202,231201]
why 231200 is not Achilles?
231200 [ 2, 2, 2, 2, 2, 5, 5, 17, 17 ]

can slay Achilles?
Oh no, you failed to defend your citadel! - Expected: [4,8,9,10,16,25,30,32,36,49,64,81,100,121,125,128,144,169,196,216,225,243,256,289,324,343,361,400,441,484,510,512,529,576,625,676,729,784,841,900,961,1000,1001,1020,1089], instead got: [4,8,9,10,16,25,30,32,36,49,64,81,100,121,125,128,144,169,196,216,225,243,256,289,324,343,361,400,441,484,4232,510,512,529,576,625,676,729,784,841,900,961,1000,1001,1020,1089]
withstood random assault 1?
Alas, your defences buckled under the pressure of a randomized army - Expected: [596,595,594,593,592,591,590,589,588,587,586,585,584,583,582,581,580,579,578,577,576,575,574,573,572,571,570,569,568,567,566,565,564,563,562,561,560,559,558,557,556,555,554,553,552,551,550,549,548,547,546,545,544,543,542,541,540,539,538,537,536,535,534,[500],533,532,531,530,529,528,527,526,525,524,523,522,521,520,519,518,517,516,515,514,513,512,511,510,509,508,507,506,505,504,503,502,501], instead got: [596,595,594,593,592,591,590,589,588,587,586,585,584,583,582,581,580,579,578,577,576,575,574,573,572,571,570,569,568,567,566,565,564,563,562,561,560,559,558,557,556,555,554,[500],553,552,551,550,549,548,547,546,545,544,543,542,541,540,539,538,537,536,535,534,533,532,531,530,529,528,527,526,525,524,523,522,521,520,519,518,517,516,515,514,513,512,511,510,509,508,507,506,505,504,503,502,501]
withstood random assault 2?
Alas, your defences buckled under the pressure of a randomized army - Expected: [59,58,57,56,55,54,53,52,51,50,49,48,47,46,45,44,43,42,41,40,39,[9747],38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,9778,9777,9776,9775,9774,9773,9772,9771,9770,9769,9768,9767,9766,9765,9764,9763,9762,9761,9760,9759,9758,9757,9756,9755,9754,9753,9752,9751,9750,9749,9748], instead got: [59,58,57,56,55,54,53,52,51,50,49,48,47,46,45,44,43,42,41,40,[9747],39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,9778,9777,9776,9775,9774,9773,9772,9771,9770,9769,9768,9767,9766,9765,9764,9763,9762,9761,9760,9759,9758,9757,9756,9755,9754,9753,9752,9751,9750,9749,9748]