michael@0: 
michael@0: // String.replace on functions returning hashmap elements.
michael@0: 
michael@0: function first() {
michael@0:   var arr = {a: "hello", b: "there"};
michael@0:   var s = 'a|b';
michael@0:   return s.replace(/[a-z]/g, function(a) { return arr[a]; }, 'g');
michael@0: }
michael@0: assertEq(first(), "hello|there");
michael@0: 
michael@0: function second() {
michael@0:   var arr = {a: "hello", c: "there"};
michael@0:   var s = 'a|b|c';
michael@0:   return s.replace(/[a-z]/g, function(a) { return arr[a]; }, 'g');
michael@0: }
michael@0: assertEq(second(), "hello|undefined|there");
michael@0: 
michael@0: Object.defineProperty(Object.prototype, "b", {get: function() { return "what"; }});
michael@0: 
michael@0: assertEq(second(), "hello|what|there");
michael@0: 
michael@0: function third() {
michael@0:   var arr = {a: "hello", b: {toString: function() { arr = {}; return "three"; }}, c: "there"};
michael@0:   var s = 'a|b|c';
michael@0:   return s.replace(/[a-z]/g, function(a) { return arr[a]; }, 'g');
michael@0: }
michael@0: assertEq(third(), "hello|three|undefined");