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Home > Web Development > Web Programming > Object-Oriented JavaScript
Object-Oriented JavaScript
Object-Oriented JavaScript

Object-Oriented JavaScript: Learn everything you need to know about object-oriented JavaScript (OOJS) , Third Edition

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Object-Oriented JavaScript

Chapter 2. Primitive Data Types, Arrays, Loops, and Conditions

Before diving into the object-oriented features of JavaScript, let's first take a look at some of the basics. This chapter walks you through the following topics:

  • The primitive data types in JavaScript, such as strings and numbers
  • Arrays
  • Common operators, such as +, -, delete, and typeof
  • Flow control statements, such as loops and if...else conditions

Variables

Variables are used to store data; they are placeholders for concrete values. When writing programs, it's convenient to use variables instead of the actual data as it's much easier to write pi instead of 3.141592653589793; especially when it happens several times inside your program. The data stored in a variable can be changed after it initially assigned, hence the name variable. You can also use variables to store data that is unknown to you while you write the code, such as the result of a later operation.

Using a variable requires the following two steps. You will need to:

  • Declare the variable
  • Initialize it, that is, give it a value

To declare a variable, you will use the var statement like the following piece of code:

    var a; 
    var thisIsAVariable;  
    var _and_this_too;  
    var mix12three;

For the names of the variables, you can use any combination of letters, numbers, the underscore character, and the dollar sign. However, you can't start with a number...

Operators

Operators take one or two values (or variables), perform an operation, and return a value. Let's check out a simple example of using an operator, just to clarify the terminology:

    > 1 + 2; 
    3

In the preceding code:

  • The + symbol is the operator
  • The operation is addition
  • The input values are 1 and 2 (they are also called operands)
  • The result value is 3
  • The whole thing is called an expression

Instead of using the values 1 and 2 directly in the expression, you can use variables. You can also use a variable to store the result of the operation as the following example demonstrates:

    > var a = 1; 
    > var b = 2; 
    > a + 1; 
    2 
    > b + 2; 
    4 
    > a + b; 
    3 
    > var c = a + b; 
    > c; 
    3

The following table lists the basic arithmetic operators:

Operator symbol

Operation

Example

+

Addition

 

> 1 + 2;   
3

-

Subtraction

 

> 99.99 - 11;   
88.99

*

Multiplication

 

> 2 * 3;   
6

/

...

Primitive data types

Any value that you use is of a certain type. In JavaScript, the following are just a few primitive data types:

  1. Number: This includes floating point numbers as well as integers. For example, these values are all numbers-1, 100, 3.14.
  2. String: These consist of any number of characters, for example, a, one, and one 2 three.
  3. Boolean: This can be either true or false.
  4. Undefined: When you try to access a variable that doesn't exist, you get the special value undefined. The same happens when you declare a variable without assigning a value to it yet. JavaScript initializes the variable behind the scenes with the value undefined. The undefined data type can only have one value-the special value undefined.
  5. Null: This is another special data type that can have only one value-the null value. It means no value, an empty value, or nothing. The difference with undefined is that if a variable has a null value, it's still defined; it just so happens that its value is nothing. You...

Primitive data types recap

Let's quickly summarize some of the main points discussed so far:

  • There are five primitive data types in JavaScript:
    • Number
    • String
    • Boolean
    • Undefined
    • Null 

  • Everything that is not a primitive data type is an object.

    The primitive number data type can store positive and negative integers or floats, hexadecimal numbers, octal numbers, exponents, and the special numbers-NaN, Infinity, and -Infinity.

  • The string data type contains characters in quotes. Template literals allow embedding of expressions inside a string.
  • The only values of the Boolean data type are true and false.
  • The only value of the null data type is the null value.
  • The only value of the undefined data type is the undefined value.
  • All values become true when converted to a Boolean, with the exception of the following six falsy values:
    • ""
    • null
    • undefined
    • 0
    • NaN
    • false

Variables

Variables are used to store data; they are placeholders for concrete values. When writing programs, it's convenient to use variables instead of the actual data as it's much easier to write pi instead of 3.141592653589793; especially when it happens several times inside your program. The data stored in a variable can be changed after it initially assigned, hence the name variable. You can also use variables to store data that is unknown to you while you write the code, such as the result of a later operation.

Using a variable requires the following two steps. You will need to:

  • Declare the variable

  • Initialize it, that is, give it a value

To declare a variable, you will use the var statement like the following piece of code:

    var a; 
    var thisIsAVariable;  
    var _and_this_too;  
    var mix12three;

For the names of the variables, you can use any combination of letters, numbers, the underscore character, and the dollar sign. However, you can't start with a...

Operators

Operators take one or two values (or variables), perform an operation, and return a value. Let's check out a simple example of using an operator, just to clarify the terminology:

    > 1 + 2; 
    3

In the preceding code:

  • The + symbol is the operator

  • The operation is addition

  • The input values are 1 and 2 (they are also called operands)

  • The result value is 3

  • The whole thing is called an expression

Instead of using the values 1 and 2 directly in the expression, you can use variables. You can also use a variable to store the result of the operation as the following example demonstrates:

    > var a = 1; 
    > var b = 2; 
    > a + 1; 
    2 
    > b + 2; 
    4 
    > a + b; 
    3 
    > var c = a + b; 
    > c; 
    3

The following table lists the basic arithmetic operators:

Operator symbol

Operation

Example

+

Addition

 

> 1 + 2;   
3

-

Subtraction

 

> 99.99...

Primitive data types

Any value that you use is of a certain type. In JavaScript, the following are just a few primitive data types:

  1. Number: This includes floating point numbers as well as integers. For example, these values are all numbers-1, 100, 3.14.

  2. String: These consist of any number of characters, for example, a, one, and one 2 three.

  3. Boolean: This can be either true or false.

  4. Undefined: When you try to access a variable that doesn't exist, you get the special value undefined. The same happens when you declare a variable without assigning a value to it yet. JavaScript initializes the variable behind the scenes with the value undefined. The undefined data type can only have one value-the special value undefined.

  5. Null: This is another special data type that can have only one value-the null value. It means no value, an empty value, or nothing. The difference with undefined is that if a variable has a null value, it's still defined; it just so happens that its value is nothing. You'll...

Primitive data types recap

Let's quickly summarize some of the main points discussed so far:

  • There are five primitive data types in JavaScript:

    • Number

    • String

    • Boolean

    • Undefined

    • Null 

  • Everything that is not a primitive data type is an object.

    The primitive number data type can store positive and negative integers or floats, hexadecimal numbers, octal numbers, exponents, and the special numbers-NaN, Infinity, and -Infinity.

  • The string data type contains characters in quotes. Template literals allow embedding of expressions inside a string.

  • The only values of the Boolean data type are true and false.

  • The only value of the null data type is the null value.

  • The only value of the undefined data type is the undefined value.

  • All values become true when converted to a Boolean, with the exception of the following six falsy values:

    • ""

    • null

    • undefined

    • 0

    • NaN

    • false

Arrays

Now that you know about the basic primitive data types in JavaScript, it's time to move to a more powerful data structure-the array.

So, what is an array? It's simply a list (a sequence) of values. Instead of using one variable to store one value, you can use one array variable to store any number of values as elements of the array.

To declare a variable that contains an empty array, you can use square brackets with nothing between them, as shown in the following line of code:

    > var a = [];

To define an array that has three elements, you can write the following line of code:

    > var a = [1, 2, 3];

When you simply type the name of the array in the console, you can get the contents of your array:

    > a; 
    [1, 2, 3]

Now the question is how to access the values stored in these array elements. The elements contained in an array are indexed with consecutive numbers, starting from zero. The first element has index (or position) 0, the second has index...

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Key benefits

  • This book has been updated to cover all the new object-oriented features introduced in ECMAScript 6
  • It makes object-oriented programming accessible and understandable to web developers
  • Write better and more maintainable JavaScript code while exploring interactive examples that can be used in your own scripts

Description

JavaScript is an object-oriented programming language that is used for website development. Web pages developed today currently follow a paradigm that has three clearly distinguishable parts: content (HTML), presentation (CSS), and behavior (JavaScript). JavaScript is one important pillar in this paradigm, and is responsible for the running of the web pages. This book will take your JavaScript skills to a new level of sophistication and get you prepared for your journey through professional web development. Updated for ES6, this book covers everything you will need to unleash the power of object-oriented programming in JavaScript while building professional web applications. The book begins with the basics of object-oriented programming in JavaScript and then gradually progresses to cover functions, objects, and prototypes, and how these concepts can be used to make your programs cleaner, more maintainable, faster, and compatible with other programs/libraries. By the end of the book, you will have learned how to incorporate object-oriented programming in your web development workflow to build professional JavaScript applications.

Who is this book for?

This book is ideal for new to intermediate JavaScript developers who want to prepare themselves for web development problems solved by object-oriented JavaScript!

What you will learn

  • Apply the basics of object-oriented programming in the JavaScript environment
  • Use a JavaScript Console with complete mastery
  • Make your programs cleaner, faster, and compatible with other programs and libraries
  • Get familiar with Iterators and Generators, the new features added in ES6
  • Find out about ECMAScript 6's Arrow functions, and make them your own
  • Understand objects in Google Chrome developer tools and how to use them
  • Use a mix of prototypal inheritance and copying properties in your workflow
  • Apply reactive programming techniques while coding in JavaScript
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Publication date : Jan 12, 2017
Length: 550 pages
Edition : 3rd
Language : English
ISBN-13 : 9781785880568
Category :
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Languages :
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Length: 550 pages
Edition : 3rd
Language : English
ISBN-13 : 9781785880568
Category :
Web Development
Languages :
JavaScript
Concepts :
Web Programming
Tools :
Arrow

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Table of Contents

18 Chapters
1. Object-Oriented JavaScript Chevron down icon Chevron up icon
1. Object-Oriented JavaScript
A bit of history
ECMAScript 5
ECMAScript 6
Object-oriented programming
OOP summary
Setting up your training environment
Summary
2. Primitive Data Types, Arrays, Loops, and Conditions Chevron down icon Chevron up icon
2. Primitive Data Types, Arrays, Loops, and Conditions
Variables
Operators
Primitive data types
Primitive data types recap
Arrays
Conditions and loops
Comments
Exercises
Summary
3. Functions Chevron down icon Chevron up icon
3. Functions
What is a function?
Default parameters
Rest parameters
Spread operators
Scope of variables
Block scope
Functions are data
Closures
IIFE versus blocks
Arrow functions
Exercises
Summary
4. Objects Chevron down icon Chevron up icon
4. Objects
From arrays to objects
Object properties and attributes
ES6 object methods
Destructuring
Built-in objects
ES6 array methods
Lexical this in arrow functions
Exercises
Summary
5. ES6 Iterators and Generators Chevron down icon Chevron up icon
5. ES6 Iterators and Generators
For...of loop
Iterators and iterables
Generators
Collections
Summary
6. Prototype Chevron down icon Chevron up icon
6. Prototype
The prototype property
Using the prototype's methods and properties
Augmenting built-in objects
Exercises
Summary
7. Inheritance Chevron down icon Chevron up icon
7. Inheritance
Prototype chaining
Inheriting the prototype only
Uber - access to the parent from a child object
Isolating the inheritance part into a function
Copying properties
Heads-up when copying by reference
Objects inherit from objects
Deep copy
Using object() method
Using a mix of prototypal inheritance and copying properties
Multiple inheritance
Parasitic inheritance
Borrowing a constructor
Case study - drawing shapes
Exercises
Summary
8. Classes and Modules Chevron down icon Chevron up icon
8. Classes and Modules
Defining classes
Subclassing
Modules
Summary
9. Promises and Proxies Chevron down icon Chevron up icon
9. Promises and Proxies
Asynchronous programming model
JavaScript call stack
Promises
Summary
10. The Browser Environment Chevron down icon Chevron up icon
10. The Browser Environment
Including JavaScript in an HTML page
BOM and DOM - an overview
BOM
DOM
Events
XMLHttpRequest
Exercises
Summary
11. Coding and Design Patterns Chevron down icon Chevron up icon
11. Coding and Design Patterns
Coding patterns
Design patterns
Summary
12. Testing and Debugging Chevron down icon Chevron up icon
12. Testing and Debugging
Unit testing
JavaScript debugging
Summary
13. Reactive Programming and React Chevron down icon Chevron up icon
13. Reactive Programming and React
Reactive programming
React
Virtual DOM
Installing and running react
Summary
A. Reserved Words Chevron down icon Chevron up icon
A. Reserved Words
Keywords
ES6 reserved words
Previously reserved words
B. Built-in Functions Chevron down icon Chevron up icon
B. Built-in Functions
C. Built-in Objects Chevron down icon Chevron up icon
C. Built-in Objects
Object
ES6 addition to objects
Array
Function
Boolean
Number
String
Date
Math
RegExp
Error objects
JSON
D. Regular Expressions Chevron down icon Chevron up icon
D. Regular Expressions
E. Answers to Exercise Questions Chevron down icon Chevron up icon
E. Answers to Exercise Questions
Chapter 2, Primitive Data Types, Arrays, Loops, and Conditions
Chapter 3, Functions
Chapter 4, Objects
Chapter 5, Prototype
Chapter 6, Inheritance
Chapter 7, The Browser Environment

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Madhur Trivedi Jun 06, 2018
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It's the best book for the topic.
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Joyce Pretzer Jun 08, 2021
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I had to return this book. Grandson in prison & books have to be bought from different source.
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Ybsen Perez Dec 30, 2018
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I started reading this book with a good JavaScript knowledge basis and really wished to had bought this book before, when I was learning the lenguaje. The authors not only give great explanations for every topic, but also take us to a deeper and deeper journey inside this beautiful language. I read 5 or 6 technical book in a year, and can say It's one of my best books ever. Recommended If you are learning or have a good basis and want to improve your JavaScript programming skills.
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Anthony A. Jun 11, 2018
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I enjoy this work because it really helps you grasp OOP in ES6 and beyond. Strong OOP knowledge is very useful for React as well, and understanding how to build a good JS library or framework. This will take you JS game to the next level and help you go behind the scenes.
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Trata Javascript de una forma muy completa y actual.
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About the authors

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Profile icon Antani
Antani
Ved Antani has been building scalable server and mobile platforms using JavaScript, Go, and Java since 2005. He is an associate vice president at Myntra and has previously worked at Electronic Arts and Oracle. He is an avid reader and author on several subjects. He has studied computer science and currently lives in Bangalore, India. Ved is passionate about classical music and loves to spend time with his son.
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Profile icon Stoyan Stefanov
Stoyan Stefanov
Stoyan Stefanov is a Facebook engineer, author, and speaker. He talks regularly about web development topics at conferences, and his blog, www.phpied.com. He also runs a number of other sites, including JSPatterns.com - a site dedicated to exploring JavaScript patterns. Previously at Yahoo!, Stoyan was the architect of YSlow 2.0 and creator of the image optimization tool, Smush.it. A "citizen of the world", Stoyan was born and raised in Bulgaria, but is also a Canadian citizen, currently residing in Los Angeles, California. In his offline moments, he enjoys playing the guitar, taking flying lessons, and spending time at the Santa Monica beaches with his family.
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FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela