18 Questions
What is the main advantage of client-side scripting in JavaScript?
enabling dynamic interactions with web pages without requiring server-side processing
What is the purpose of event handlers in JavaScript?
to create responsive and interactive web applications that respond to user actions
What are the two categories of data types in JavaScript?
Primitive types and Object types
What is the scope of a variable declared with the var keyword?
the function in which it is declared, or globally if declared outside of any function
What is the difference between the var and let keywords in JavaScript?
var has function scope, while let has block scope
What is the purpose of the const keyword in JavaScript?
to declare a constant variable that cannot be reassigned
What is the return type of typeof 42 in JavaScript?
number
What is a limitation of JavaScript related to security?
Security Risks, such as cross-site scripting (XSS) attacks
What event is triggered when a key is pressed and released while the focus is on an element in JavaScript?
onkeypress
What is a non-primitive data type in JavaScript that represents an ordered collection of elements?
Array
What is a limitation of JavaScript related to performance?
Heavy reliance on JavaScript can impact page load times and overall performance
What is the purpose of the onmouseover event in JavaScript?
To trigger actions when the mouse pointer is moved onto an element
What is one of the limitations of JavaScript due to its client-side execution?
exposure of sensitive logic or data to users
Why is it important to test JavaScript code across different browsers?
to ensure compatibility and consistent behavior
What is the purpose of the toUpperCase() method in JavaScript?
to convert a string to uppercase
What is the primary function of CSS selectors in web development?
to target and apply styles to specific HTML elements
What is the purpose of the var_dump() function in PHP?
to display structured information about one or more variables, including its type and value
What is the significance of using var_dump() in PHP development?
it is commonly used for debugging purposes
Test your knowledge of JavaScript fundamentals, including client-side scripting, event-driven programming, and data types. Learn how JavaScript enables dynamic interactions with web pages and creates responsive applications.
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