stringCharCodeAt.js (1254B)
1 assertEq("foo".charCodeAt(-123), NaN); 2 assertEq("foo".charCodeAt(-0), 102); 3 assertEq("foo".charCodeAt(0), 102); 4 assertEq("foo".charCodeAt(2), 111); 5 assertEq("foo".charCodeAt(3.4), NaN); 6 assertEq("foo".charCodeAt(), 102); 7 assertEq("".charCodeAt(), NaN); 8 assertEq("".charCodeAt(0), NaN); 9 10 /* Inferred as string.charCodeAt(int). */ 11 function charCodeAt1(x) { 12 return "abc".charCodeAt(x); 13 } 14 assertEq(charCodeAt1(-1), NaN); 15 assertEq(charCodeAt1(0), 97); 16 assertEq(charCodeAt1(1), 98); 17 assertEq(charCodeAt1(2), 99); 18 assertEq(charCodeAt1(3), NaN); 19 assertEq(charCodeAt1(1234), NaN); 20 21 /* Inferred as string.charCodeAt(double). */ 22 function charCodeAt2(x) { 23 return "abc".charCodeAt(x); 24 } 25 assertEq(charCodeAt2(-1.3), NaN); 26 assertEq(charCodeAt2(-0), 97); 27 assertEq(charCodeAt2(2), 99); 28 assertEq(charCodeAt2(2.3), 99); 29 assertEq(charCodeAt2(3.14), NaN); 30 assertEq(charCodeAt2(NaN), 97); 31 32 /* Test ropes. */ 33 function charCodeAt3(s, i) { 34 var s2 = "abcdef" + s + "12345"; 35 return s2.charCodeAt(i); 36 } 37 assertEq(charCodeAt3("abcdef", 14), 51); 38 assertEq(charCodeAt3("a" + "b", 1), 98); 39 assertEq(charCodeAt3("abcdefg" + "hijklmnop", 10), 101); 40 41 /* Other 'this'. */ 42 var n = new Number(123); 43 n.charCodeAt = String.prototype.charCodeAt; 44 assertEq(n.charCodeAt(1), 50);