Room 51

Get Programming with JavaScript - Listing 10.04

Listing 10.04 - Using Object.keys


var ages = {
    "Kandra Smith" : 56,
    "Dax Aniaku"   : 210,
    "Blinky"       : 36
};

var keys = Object.keys(ages);

console.log(keys);

Further Adventures

Listing 10.04 - Using Object.keys - Task 1

Add a couple more key-value pairs to the ages object.


var ages = {
    "Kandra Smith" : 56,
    "Dax Aniaku"   : 210,
    "Blinky"       : 36,
    "Filboid Studge"   : 120,
    "??? Mr Nigma ???" : 37
};

var keys = Object.keys(ages);

console.log(keys);

Listing 10.04 - Using Object.keys - Task 2

Add another property to the ages object using square bracket notation.
Add the code before the call to Object.keys, so the new key will be logged to the console.


var ages = {
    "Kandra Smith" : 56,
    "Dax Aniaku"   : 210,
    "Blinky"       : 36,
    "Filboid Studge"   : 120,
    "??? Mr Nigma ???" : 37
};

// another property
ages["Yet another property!!!"] = 16;

var keys = Object.keys(ages);

console.log(keys);