Get Programming with JavaScript - Listing 10.05

Get Programming with JavaScript - Listing 10.05

Listing 10.05 - Iterating over Object.keys with forEach

var ages = {
    "Kandra Smith" : 56,
    "Dax Aniaku"   : 21,
    "Blinky"       : 36
};

var keys = Object.keys(ages);

keys.forEach(function (key) {
    console.log(key);
});

Further Adventures

Listing 10.05 - Iterating over Object.keys with forEach - Task 1

Add three more people to the ages object:
One directly to the object,
one using square brackets and
one using dot notation.

var ages = {
    "Kandra Smith" : 56,
    "Dax Aniaku"   : 21,
    "Blinky"       : 36,
    "Filboid Studge" : 120
};

ages["??? Mr Nigma ???"] = 37;
ages.Jahver = 200;

var keys = Object.keys(ages);

keys.forEach(function (key) {
    console.log(key);
});

Listing 10.05 - Iterating over Object.keys with forEach - Task 2

Update the call to console.log so it shows the age of each person. Remember, the key lets you access the value from the ages object.

var ages = {
    "Kandra Smith" : 56,
    "Dax Aniaku"   : 21,
    "Blinky"       : 36,
    "Filboid Studge" : 120
};

ages["??? Mr Nigma ???"] = 37;
ages.Jahver = 200;

var keys = Object.keys(ages);

keys.forEach(function (key) {
    console.log(key + " is " + ages[key]);
});

Listing 10.05 - Iterating over Object.keys with forEach - Task 3

Update the call to console.log so it shows the person's name along with the length of their name.

var ages = {
    "Kandra Smith" : 56,
    "Dax Aniaku"   : 21,
    "Blinky"       : 36,
    "Filboid Studge" : 120
};

ages["??? Mr Nigma ???"] = 37;
ages.Jahver = 200;

var keys = Object.keys(ages);

keys.forEach(function (key) {
    console.log(key + ": " + key.length);
});