michael@0: 
michael@0: assertEq("foo".charCodeAt(-123), NaN);
michael@0: assertEq("foo".charCodeAt(-0), 102);
michael@0: assertEq("foo".charCodeAt(0), 102);
michael@0: assertEq("foo".charCodeAt(2), 111);
michael@0: assertEq("foo".charCodeAt(3.4), NaN);
michael@0: assertEq("foo".charCodeAt(), 102);
michael@0: assertEq("".charCodeAt(), NaN);
michael@0: assertEq("".charCodeAt(0), NaN);
michael@0: 
michael@0: /* Inferred as string.charCodeAt(int). */
michael@0: function charCodeAt1(x) {
michael@0:     return "abc".charCodeAt(x);
michael@0: }
michael@0: assertEq(charCodeAt1(-1), NaN);
michael@0: assertEq(charCodeAt1(0), 97);
michael@0: assertEq(charCodeAt1(1), 98);
michael@0: assertEq(charCodeAt1(2), 99);
michael@0: assertEq(charCodeAt1(3), NaN);
michael@0: assertEq(charCodeAt1(1234), NaN);
michael@0: 
michael@0: /* Inferred as string.charCodeAt(double). */
michael@0: function charCodeAt2(x) {
michael@0:     return "abc".charCodeAt(x);
michael@0: }
michael@0: assertEq(charCodeAt2(-1.3), NaN);
michael@0: assertEq(charCodeAt2(-0), 97);
michael@0: assertEq(charCodeAt2(2), 99);
michael@0: assertEq(charCodeAt2(2.3), 99);
michael@0: assertEq(charCodeAt2(3.14), NaN);
michael@0: assertEq(charCodeAt2(NaN), 97);
michael@0: 
michael@0: /* Test ropes. */
michael@0: function charCodeAt3(s, i) {
michael@0:     var s2 = "abcdef" + s + "12345";
michael@0:     return s2.charCodeAt(i);
michael@0: }
michael@0: assertEq(charCodeAt3("abcdef", 14), 51);
michael@0: assertEq(charCodeAt3("a" + "b", 1), 98);
michael@0: assertEq(charCodeAt3("abcdefg" + "hijklmnop", 10), 101);
michael@0: 
michael@0: /* Other 'this'. */
michael@0: var n = new Number(123);
michael@0: n.charCodeAt = String.prototype.charCodeAt;
michael@0: assertEq(n.charCodeAt(1), 50);
michael@0: 
michael@0: