test_assignment.js

// test_assignment.js
// ------------------

var assert = console.assert;

var assertEquals = function(a, b) {
  return a === b;
};

var test = function(name, f) {
  f();
};


test('Variable assignment', function() {
  var x = 0;

  x += 4;
  assertEquals(4, x);

  x /= 2;
  assertEquals(2, x);

  x -= 1;
  assertEquals(1, x);

  x *= 7;
  assertEquals(7, x);
});

test('Assignment with member expressions', function() {
  var y = {};

  y.a = 42;
  assertEquals(42, y.a);

  y.b = 56;
  y.b += 10;
  assertEquals(66, y.b);

  y.c = 17;
  y.c *= 45;
  assertEquals(765, y.c);

  // A little crazy, but viable:
  var z = {};
  z.a = {};
  z.a.b = {};
  z.a.b.c = {};
  z.a.b.c.d = {};
  z.a.b.c.d.e = 42;
  assertEquals(42, z.a.b.c.d.e);
});