freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/accessing-object-properties-with-dot-notation.english.md

id	title	challengeType
56533eb9ac21ba0edf2244c7	Accessing Object Properties with Dot Notation	1

Description

There are two ways to access the properties of an object: dot notation (.) and bracket notation ([]), similar to an array. Dot notation is what you use when you know the name of the property you're trying to access ahead of time. Here is a sample of using dot notation (.) to read an object's property:

var myObj = {
  prop1: "val1",
  prop2: "val2"
};
var prop1val = myObj.prop1; // val1
var prop2val = myObj.prop2; // val2

Instructions

Read in the property values of testObj using dot notation. Set the variable hatValue equal to the object's property hat and set the variable shirtValue equal to the object's property shirt.

Tests

tests:
  - text: <code>hatValue</code> should be a string
    testString: assert(typeof hatValue === 'string' , '<code>hatValue</code> should be a string');
  - text: The value of <code>hatValue</code> should be <code>"ballcap"</code>
    testString: assert(hatValue === 'ballcap' , 'The value of <code>hatValue</code> should be <code>"ballcap"</code>');
  - text: <code>shirtValue</code> should be a string
    testString: assert(typeof shirtValue === 'string' , '<code>shirtValue</code> should be a string');
  - text: The value of <code>shirtValue</code> should be <code>"jersey"</code>
    testString: assert(shirtValue === 'jersey' , 'The value of <code>shirtValue</code> should be <code>"jersey"</code>');
  - text: You should use dot notation twice
    testString: assert(code.match(/testObj\.\w+/g).length > 1, 'You should use dot notation twice');

Challenge Seed

// Setup
var testObj = {
  "hat": "ballcap",
  "shirt": "jersey",
  "shoes": "cleats"
};

// Only change code below this line

var hatValue = testObj;      // Change this line
var shirtValue = testObj;    // Change this line

After Test

(function(a,b) { return "hatValue = '" + a + "', shirtValue = '" + b + "'"; })(hatValue,shirtValue);

Solution

var testObj = {
  "hat": "ballcap",
  "shirt": "jersey",
  "shoes": "cleats"
};

var hatValue = testObj.hat;
var shirtValue = testObj.shirt;