strange_i_know.js

function just_a_test() {
  console.log(this);
  this[arguments[0]] = arguments[1];
}

just_a_test('a', true);
console.log(window.a);

var obj = {'well': true, 'that_is': [1, 2, 3]}
just_a_test.call(obj, 'that_is', 'hu3');
console.log(obj['that_is']);