When an object is changed after it's been given to console.log but before the event loop happens, console.log outputs the new value instead of what was originally given to console.log. STR: 1. Open console 2. Open testase The json output and the Object output should be the same, but it outputs: "["test","test2"]" Array [ "test", "test6969" ] "["test","test6969"]" Array [ "test", "test6969" ] "{"test":"test","test2":"test2"}" Object { test: "test", test2: "test200" } "{"test":"test","test2":"test6969"}" Object { test: "test", test2: "test200" } "{"test":"test","test2":"test9696"}" Object { test: "test", test2: "test200" } "{"test":"test","test2":"test5"}" Object { test: "test", test2: "test200" } "{"test":"test","test2":"test100"}" Object { test: "test", test2: "test200" } "{"test":"test","test2":"test200"}" Object { test: "test", test2: "test200" } "{"test":"test","test2":"test300"}" Object { test: "test", test2: "test400" } "{"test":"test","test2":"test400"}" Object { test: "test", test2: "test400" }

There is detailed discussion about this in bug 754861.