Oliver Eyton-Williams 0bd52f8bd1

and change all the challenges to new `md` format.

2020-11-27 10:02:05 -08:00

2.1 KiB

Raw Blame History

id, title, challengeType, videoUrl, forumTopicId

id	title	challengeType	videoUrl	forumTopicId
56533eb9ac21ba0edf2244c8	Accessing Object Properties with Bracket Notation	1	https://scrimba.com/c/cBvmEHP	16163

--description--

The second way to access the properties of an object is bracket notation ([]). If the property of the object you are trying to access has a space in its name, you will need to use bracket notation.

However, you can still use bracket notation on object properties without spaces.

Here is a sample of using bracket notation to read an object's property:

var myObj = {
  "Space Name": "Kirk",
  "More Space": "Spock",
  "NoSpace": "USS Enterprise"
};
myObj["Space Name"]; // Kirk
myObj['More Space']; // Spock
myObj["NoSpace"];    // USS Enterprise

Note that property names with spaces in them must be in quotes (single or double).

--instructions--

Read the values of the properties "an entree" and "the drink" of testObj using bracket notation and assign them to entreeValue and drinkValue respectively.

--hints--

entreeValue should be a string

assert(typeof entreeValue === 'string');

The value of entreeValue should be "hamburger"

assert(entreeValue === 'hamburger');

drinkValue should be a string

assert(typeof drinkValue === 'string');

The value of drinkValue should be "water"

assert(drinkValue === 'water');

You should use bracket notation twice

assert(code.match(/testObj\s*?\[('|")[^'"]+\1\]/g).length > 1);

--seed--

--after-user-code--

(function(a,b) { return "entreeValue = '" + a + "', drinkValue = '" + b + "'"; })(entreeValue,drinkValue);

--seed-contents--

// Setup
var testObj = {
  "an entree": "hamburger",
  "my side": "veggies",
  "the drink": "water"
};

// Only change code below this line

var entreeValue = testObj;   // Change this line
var drinkValue = testObj;    // Change this line

--solutions--

var testObj = {
  "an entree": "hamburger",
  "my side": "veggies",
  "the drink": "water"
};
var entreeValue = testObj["an entree"];
var drinkValue = testObj['the drink'];

2.1 KiB Raw Blame History