LPI W - Web Essentials
JavaScript
Here are 15 questions with detailed explanations for certification Web Essentials by Linux Professional Institute about JavaScript:
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What is JavaScript?
JavaScript is a programming language that is used to create interactive web pages. It is a text-based language that is interpreted by web browsers.
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What are the benefits of using JavaScript?
- It is a versatile language that can be used to create a variety of web applications.
- It is easy to learn and use.
- It is supported by all major web browsers.
- It is a powerful language that can be used to create complex web applications.
- What are the drawbacks of using JavaScript?
- It is not as fast as some other programming languages.
- It can be difficult to debug.
- It can be difficult to maintain large JavaScript applications.
- What are the different types of JavaScript?
- Regular JavaScript
- Regular JavaScript is the standard JavaScript language
- TypeScript
- TypeScript is a superset of JavaScript that adds features such as classes, interfaces, and modules.
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What is the syntax of JavaScript?
The syntax of JavaScript is similar to that of other programming languages. It uses keywords, variables, operators, and functions.
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What is the difference between a variable and a constant?
A variable is a storage location that can hold a value. A constant is a storage location that can hold a value that cannot be changed.
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What are the different operators in JavaScript?
- Arithmetic operators
- Logical operators
- Relational operators
- Assignment operators
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What is a function?
A function is a block of code that performs a specific task. Functions can be used to organize code and to make it reusable.
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What is an object?
An object is a data structure that contains properties and methods. Objects can be used to model real-world objects.
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What is an array?
An array is a data structure that contains a list of values. Arrays can be used to store data in a more organized way.
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What is a loop?
A loop is a block of code that executes multiple times. Loops can be used to repeat tasks or to iterate over a collection of data.
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What is a conditional statement?
A conditional statement is a block of code that is executed only if a condition is true. Conditional statements can be used to make decisions in code.
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What is an event?
An event is a notification that is sent by a web browser to a JavaScript application. Events can be used to handle user input and to respond to changes in the web page.
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What is a callback function?
A callback function is a function that is executed after an event has been triggered. Callback functions can be used to respond to changes in the web page.
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What is a promise?
A promise is an object that represents the result of an asynchronous operation. Promises can be used to make asynchronous code more manageable.
These are just a few of the many questions that could be asked about JavaScript. The Linux Professional Institute certification Web Essentials covers a wide range of topics related to JavaScript, and these questions should give you a good foundation for understanding the material.
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