Get Programming with JavaScript

Get Programming with JavaScript - Listing 7.01

Listing 7.01 - Passing a function an object as an argument

var planet1;
var getPlanetInfo;

planet1 = {
    name: "Jupiter",
    position: 5,
    type: "Gas Giant",
    radius: 69911,
    sizeRank: 1
};

getPlanetInfo = function (planet) {
    return planet.name + ": planet number " + planet.position;
};

console.log(getPlanetInfo(planet1));

Further Adventures

Listing 7.01 - Passing a function an object as an argument - Tasks 1&2

Create a second planet object.
Use getPlanetInfo to log details of the second planet.

var planet1;
var planet2;   // declare a variable
var getPlanetInfo;

planet1 = {
    name: "Jupiter",
    position: 5,
    type: "Gas Giant",
    radius: 69911,
    sizeRank: 1
};

// create a second object and
// assign it to your variable
planet2 = {
    name: "Neptune",
    position: 8,
    type: "Ice Giant",
    radius: 24622,
    sizeRank: 4
};

getPlanetInfo = function (planet) {
    return planet.name + ": planet number " + planet.position;
};

console.log(getPlanetInfo(planet1));
console.log(getPlanetInfo(planet2));   // log planet2

Listing 7.01 - Passing a function an object as an argument - Task 3

Update the getPlanetInfo function to include more information about each planet.

var planet1;
var planet2;
var getPlanetInfo;

planet1 = {
    name: "Jupiter",
    position: 5,
    type: "Gas Giant",
    radius: 69911,
    sizeRank: 1
};

planet2 = {
    name: "Neptune",
    position: 8,
    type: "Ice Giant",
    radius: 24622,
    sizeRank: 4
};

// include extra info
getPlanetInfo = function (planet) {
    var info = planet.name + ": planet number " + planet.position;
    info += "\n" + planet.type + " of radius " + planet.radius + "km";
    info += " (" + planet.sizeRank + ")";
    return info;
};

console.log(getPlanetInfo(planet1));
console.log(getPlanetInfo(planet2));