This document provides an overview of JavaScript, including its history, uses, syntax, variables, data types, operators, conditional statements, loops, functions, and ways to display output. Some key points:
- JavaScript is a scripting language used to add interactivity to HTML pages. It was originally developed by Brendan Eich at Netscape under the names Mocha and LiveScript.
- JavaScript code can be embedded within HTML using <script> tags or linked externally via the src attribute. Common uses include form validation, dynamic updating of content, and interactive effects.
- The language supports variables, arrays, objects, numbers, strings, booleans, and other data types. Conditional statements like if
A JavaScript function is a block of code designed to perform a particular task.
Why Functions?
You can reuse code: Define the code once, and use it many times. You can use the same code many times with different arguments, to produce different results.
JavaScript - Chapter 4 - Types and StatementsWebStackAcademy
A computer program is a list of "instructions" to be "executed" by a computer.
In a programming language, these programming instructions are called statements.
A JavaScript program is a list of programming statements.
JavaScript statements are composed of:
Values, Operators, Expressions, Keywords, and Comments.
This statement tells the browser to write "Hello Dolly." inside an HTML element with id="demo":
JavaScript Data Types
JavaScript variables can hold many data types: numbers, strings, objects and more.
In programming, data types is an important concept.
To be able to operate on variables, it is important to know something about the type.
A JavaScript function is a block of code designed to perform a particular task.
Why Functions?
You can reuse code: Define the code once, and use it many times. You can use the same code many times with different arguments, to produce different results.
JavaScript - Chapter 4 - Types and StatementsWebStackAcademy
A computer program is a list of "instructions" to be "executed" by a computer.
In a programming language, these programming instructions are called statements.
A JavaScript program is a list of programming statements.
JavaScript statements are composed of:
Values, Operators, Expressions, Keywords, and Comments.
This statement tells the browser to write "Hello Dolly." inside an HTML element with id="demo":
JavaScript Data Types
JavaScript variables can hold many data types: numbers, strings, objects and more.
In programming, data types is an important concept.
To be able to operate on variables, it is important to know something about the type.
Functions being first-class citizens in JavaScript offers developers a tremendous amount power and
flexibilty. However, what good is all this power if you don't know how to harness it?
This talk will provide a thorough examination of JavaScript functions. Topics
that will be covered in this talk are:
* Functions are objects
* Execution Context and the Scope Chain
* Closures
* Modifying Context
* The Various Forms of Functions.
Attendees will leave this talk understanding the power of JavaScript functions and the knowledge to apply new
techiques that will make their JavaScript cleaner, leaner and more maintainable.
JavaScript - Chapter 9 - TypeConversion and Regular Expressions WebStackAcademy
Type Conversion:
JavaScript is loosely typed language and most of the time operators automatically convert a value to the right type but there are also cases when we need to explicitly do type conversions.
While JavaScript provides numerous ways to convert data from one type to another but there are two most common data conversions :
Converting Values to String
Converting Values to Numbers
Regular Expressions:
A regular expression is an object that describes a pattern of characters.
The JavaScript RegExp class represents regular expressions, and both String and RegExp define methods that use regular expressions to perform powerful pattern-matching and search-and-replace functions on text.
JavaScript String:
The String object lets you work with a series of characters; it wraps Javascript's string primitive data type with a number of helper methods.
As JavaScript automatically converts between string primitives and String objects, you can call any of the helper methods of the String object on a string primitive.
JavaScript Arrays:
The Array object lets you store multiple values in a single variable. It stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.
Functions being first-class citizens in JavaScript offers developers a tremendous amount power and
flexibilty. However, what good is all this power if you don't know how to harness it?
This talk will provide a thorough examination of JavaScript functions. Topics
that will be covered in this talk are:
* Functions are objects
* Execution Context and the Scope Chain
* Closures
* Modifying Context
* The Various Forms of Functions.
Attendees will leave this talk understanding the power of JavaScript functions and the knowledge to apply new
techiques that will make their JavaScript cleaner, leaner and more maintainable.
JavaScript - Chapter 9 - TypeConversion and Regular Expressions WebStackAcademy
Type Conversion:
JavaScript is loosely typed language and most of the time operators automatically convert a value to the right type but there are also cases when we need to explicitly do type conversions.
While JavaScript provides numerous ways to convert data from one type to another but there are two most common data conversions :
Converting Values to String
Converting Values to Numbers
Regular Expressions:
A regular expression is an object that describes a pattern of characters.
The JavaScript RegExp class represents regular expressions, and both String and RegExp define methods that use regular expressions to perform powerful pattern-matching and search-and-replace functions on text.
JavaScript String:
The String object lets you work with a series of characters; it wraps Javascript's string primitive data type with a number of helper methods.
As JavaScript automatically converts between string primitives and String objects, you can call any of the helper methods of the String object on a string primitive.
JavaScript Arrays:
The Array object lets you store multiple values in a single variable. It stores a fixed-size sequential collection of elements of the same type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type.
VB Script is a subset of Visual Basic 4.0 language. It was developed by Microsoft to provide more processing power to Web pages. VB Script can be used to write both server side and client side scripting. (If you already know Visual Basic or Visual Basic for Applications (VBA), VB Script will be very familiar. Even if you do not know Visual Basic, once you learn VB Script, you are on your way to programming with the whole family of Visual Basic languages.)
JavaScript - An Introduction is a beginner's guide to JavaScript. It starts with very basic level and goes to intermediate level. You'll be introduced with every language constructs, Event handling, Form handling and AJAX which is supported by JavaScript with XMLHttpRequest object. This XHR object is discussed in enough detail so that you can understand how the underlying AJAX functionality works in jQuery. At the end it discusses advance concepts and library build on/around JavaScript.
JavaScript basics
JavaScript event loop
Ajax and promises
DOM interaction
JavaScript object orientation
Web Workers
Useful Microframeworks
This presentation has been developed in the context of the Mobile Applications Development course, DISIM, University of L'Aquila (Italy), Spring 2014.
http://www.ivanomalavolta.com
JavaScript: The Good Parts Or: How A C# Developer Learned To Stop Worrying An...Doug Jones
We rarely dive into current programming languages, touting the next new framework or the new features that will be out next year. This is about JavaScript the language as it exists today, what I picked up in going from C# to JS, and what C# picked up from JS along the way as well. It is based on Douglas Crockford's seminal book "JavaScript: The Good Parts".
Esoft Metro Campus - Diploma in Web Engineering - (Module V) Programming with JavaScript
(Template - Virtusa Corporate)
Contents:
Introduction to JavaScript
What JavaScript Can Do?
Script tag in HTML
Noscript tag in HTML
Your First JavaScript Program
JavaScript Placement in HTML File
JavaScript Syntax
JavaScript Data Types
JavaScript Variables
JavaScript Identifiers
Arithmetic Operators
String Concatenation Operators
Assignment Operators
Comparison Operators
Logical Operators
Bitwise Operators
If Statement
If… Else Statement
If… Else if… Else Statement
Switch Statement
The ? Operator
While Loop
Do While Loop
For Loop
For…in Loop
break Statement
continue Statement
Arrays
Functions
JavaScript Objects
JavaScript Scope
Strings
Regular Expressions
JavaScript Numbers
Math Object
Date and Time
JavaScript Events
Dialog Boxes
Error Handling in JavaScript
JavaScript Forms Validation
JavaScript HTML DOM
JavaScript BOM
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Neuro-symbolic is not enough, we need neuro-*semantic*
Javascript
1.
2.
3. JS is a dynamic programming language.
It is a scripting language (lightweight
programming language) which is designed
to add interactivity to HTML pages.
5. Developed under the name Mocha
Officially called LiveScript when it first shipped in
beta releases of Netscape Navigator 2.0 in September
1995
But renamed JavaScript when it was deployed in the
Netscape browser version 2.0B3 .
JavaScript was standardized under ECMA
International for consideration as an industry
standard, and subsequent work resulted in the
version named ECMAScript (European Computer
Manufacturers Association Script)
CONTINUE…
6. Interpreted language.
Easy debugging and testing.
Embedded within HTML.
Minimal syntax , easy to learn.
Platform independent.
Procedural capabilities.
Less server interaction.
Immediate feedback to the visitors.
7. Using the <script> tag .
Syntax
<script >
//JS code
</script>
8. language : Specify scripting
language you are using.
src : To access an external script.
13. 3) External script
Used for multiple pages.
Script will be written as external independent file.
Have .js extension.
Referred using “src” attribute.
Example :
<head>
<script src = “myfile.js”>
</script>
</head>
14. A variable is a named element in a
program that stores information.
The following restrictions apply to
variable names:
Names can contain letters, digits,
underscores, and dollar signs.
Names must begin with a letter.
Names can also begin with $ and _ .
Names are case sensitive.
15. Syntax
var <variable name> = value ;
Example : var FirstName = “Shah”;
When you declare a variable within a function, the
variable can only be accessed within that function.
If you declare a variable outside a function, all the
functions on your page can access it.
The lifetime of these variables starts when they
are declared, and ends when the page is closed.
16. Primitive data types
Number: integer , floating-point, NaN numbers.
Boolean: true or false.
String: a sequence of alphanumeric characters
enclosed in “ ” or ‘ ’.
Null: the only value is "null" – to represent nothing.
Complex data types
Object: a named collection of data.
Array: a sequence of values (an array is actually a
predefined object.
17. Represented by the Array object.
Index of array runs from 0 to N-1.
Can store values of different types.
Syntax
var arrayName = new Array(Array_length);
var arrayName = new Array();
Dense Array
Each element assigned with a specific value.
arrayName = new Array(value0, value1, value2…);
18.
19.
20. Operators are used to handle variables.
Combination of an operand and operator is referred to as
expression.
Types of Operator
Arithmetic , Logical , Comparison, String , Conditional.
Special Operators
New : Create an instance of object type.
Delete : Deletes property of an object or an element at an
array index.
Void : It does not return a value. It is used in JS to return a
URL with no value.
21.
22. Logical AND ( && )
OP1 && OP2
Logical OR ( | | )
OP1 || OP2
Logical NOT ( ! )
!( OP1 )
23.
24. The typeof operator to find the data type of a
JavaScript variable.
Eg :
typeof "John" // Returns string
typeof 3.14 // Returns number
typeof NaN // Returns number
typeof false // Returns boolean
typeof [1,2,3,4] // Returns object
25. String operator
These are those operators which are used to perform
operation on string.
JS only support string concatenation operator ‘+’.
Example : “ ab ” + “ cd ”
Conditional operator (Ternary operator)
Condition ? Value1 : Value2 ;
Consist of 3 Operand – a condition to be evaluated
and two alternative values to be returned based on
the outcome of expression.
If true , return value1
If false, return value2
26. In JavaScript we have the following
conditional statements:
1) IF
2) IF – ELSE
3) ELSE – IF
4) SWITCH
27. Use the if statement to specify a block of
JavaScript code to be executed if a
condition is true.
Syntax
if (condition) {
block of code to be executed if the
condition is true
}
Note that if is in lowercase letters.
Uppercase letters (If or IF) will generate a
JavaScript error.
28. Example: Make a "Good day" greeting if the
hour is less than 18:00 .
if (hour < 18)
{
greeting = "Good day";
}
Output
Good day
29. Use the else statement to specify a block of
code to be executed if the condition is false.
Syntax
if (condition) {
block of code to be executed if the condition
is true
}
else {
block of code to be executed if the condition
is false
}
30. Example : If the hour is less than 18, create "Good
day" greeting, otherwise "Good evening“.
if (hour < 18)
{
greeting = "Good day";
}
else
{
greeting = "Good evening";
}
31. Use the else if statement to specify a new condition if the
first condition is false.
Syntax
if (condition1) {
block of code to be executed if condition1 is true }
else if (condition2) {
block of code to be executed if the condition1 is false and
condition2 is true }
else{
block of code to be executed if the condition1 is false and
condition2 is false }
32. Example : If time is less than 10:00, create a "Good
morning" greeting, if not, but time is less than
20:00, create a "Good day" greeting, otherwise a
"Good evening“.
if (time < 10) {
greeting = "Good morning";
}
else if (time < 20) {
greeting = "Good day";
}
else {
greeting = "Good evening";
}
33. Use the switch statement to select one of many
blocks of code to be executed.
Syntax
switch(expression) {
case value1 : code block
break;
case value2 : code block
break;
default : default code block
}
34. Example : weekday number to calculate weekday name:
switch (day) {
case 0 : "Sunday“; break;
case 1 : "Monday"; break;
case 2 : "Tuesday"; break;
case 3 : "Wednesday"; break;
case 4 "Thursday"; break;
case 5 : "Friday"; break;
case 6 : "Saturday"; break;
}
35. JavaScript supports different kinds of loops:
1) for - loops through a block of code a number of
times.
2) while - loops through a block of code while a
specified condition is true.
36. Syntax
for (exp1; condition; exp2)
{
code block to be executed
}
Example
for (i = 0; i < 5; i++)
{
text += i ;
}
37. The for each...in statement iterates a
specified variable over all values of object's
properties. For each distinct property, a
specified statement is executed.
41. A JavaScript function is a block of code designed to
perform a particular task.
It often returns a value.
A JavaScript function is executed when "something"
invokes it (calls it).
May take zero or more parameters.
Built-in Functions
1) eval() : evaluates an expression or statement.
eval("3 + 4"); // Returns 7 (Number)
eval("alert('Hello')");// Calls the function alert('Hello')
42. 2)parseInt() : Converts string literals to integers
Parses up to any character that is not part of a valid
integer
parseInt("3 chances") // returns 3
parseInt(" 5 alive") // returns 5
parseInt("How are you") // returns NaN
3)parseFloat() : Finds a floating point value at the
beginning of a string.
parseFloat("3e-1 xyz") // returns 0.3
parseFloat("13.5 abc") // returns 13.5
43. var x = 16 + "Volvo";
var x = 16 + 4 + "Volvo";
var x = "Volvo" + 16 + 4;
44. <script language="javascript">
var a = "334";
var b = 3;
var c = parseInt(a)+b;
var d = a+b;
document.write("parseInt(a)+b = “ c);
document.write(" a+b = “ d);
</script>
45. Syntax
function function_name(para1, para2,….)
{
code to be executed
}
A JavaScript function is defined with
the function keyword, followed by a name, followed by
parentheses ().
Function names can contain letters, digits,
underscores, and dollar signs (same rules as variables).
The code to be executed, by the function, is placed
inside curly brackets { } .
46. Function arguments are the real values received
by the function when it is invoked.
Inside the function, the arguments are used as
local variables.
Example
function myFunction(p1, p2)
{
return p1 * p2;
// returns product of p1 and p2
}
47. Example : Calculate the product of two numbers, and
return the result.
var x = myFunction(4, 3); // Function is called, return
value will end up in x
function myFunction(a, b)
{
return a * b; // Function returns the product of a and b
}
The result in x will be:
12
48. JavaScript can "display" data in different ways:
1. Writing into an alert box,
using window.alert().
2. Writing into the HTML output
using document.write().
3. Writing into an HTML element,
using innerHTML.
4. Writing into the browser console,
using console.log().
57. JavaScript has three kind of popup
boxes:
1) Alert box,
2) Confirm box,
3) Prompt box.
58. An alert box is often used if you want to make sure
information comes through to the user.
When an alert box pops up, the user will have to
click "OK" to proceed.
Syntax
window.alert("sometext");
The window.alert() method can be written without
the window prefix.
Example
alert("I am an alert box!");
59. A confirm box is often used if you want the
user to verify or accept something.
When a confirm box pops up, the user will
have to click either "OK" or "Cancel" to
proceed.
If the user clicks "OK", the box returns true. If
the user clicks "Cancel", the box returns false.
Syntax
window.confirm("some text");
60. The window.confirm() method can be written without the
window prefix.
Example
var r = confirm("Press a button");
if (r == true)
{
x = "You pressed OK!";
}
else
{
x = "You pressed Cancel!";
}
61. A prompt box is often used if you want the
user to input a value before entering a page.
When a prompt box pops up, the user will
have to click either "OK" or "Cancel" to
proceed after entering an input value.
If the user clicks "OK" the box returns the
input value. If the user clicks "Cancel" the box
returns null.
Syntax
window.prompt("sometext","defaultText");
62. The window.prompt() method can be written
without the window prefix.
Example
var person = prompt("Please enter your
name", “Steve");
if (person != null)
{
document.getElementById(id) = "Hello " + person
+ "! How are you ?";
}