AboutObjects.js: Completed "should know that properties can be added and deleted" - using in keyword to check before/after declaring new properties as well as using the keyword delete to remove existing properties.
AboutObjects.js: Completed "should know that properties can be added and deleted"
- using in keyword to check before/after declaring new properties as well as using the keyword delete to remove existing properties.

ning-github/javascript-koans,ning-github/javascript-koans,ning-github/javascript-koans