Q
What is the fastest jQuery selector?

Answer & Solution

Answer: Option B
Solution:
ID selectors are the fastest because IDs are unique and browsers optimize for this.
Related Questions on Average

How can you delay the loading of images to improve performance?

A). Use the .load() method

B). Use a lazy load plugin

C). Use the .ready() method

D). Use inline styles

How does event delegation improve performance?

A). By using fewer event handlers

B). By using more event handlers

C). By attaching handlers directly to elements

D). By avoiding event handling

What is the best practice for handling frequent events like scroll or resize?

A). Use .off() to remove handlers

B). Use inline event handlers

C). Use debounce or throttle

D). Use .bind() method

How can you minimize DOM manipulation reflows?

A). Use inline styles

B). Use CSS classes

C). Batch DOM changes

D). Avoid using jQuery

How can you optimize AJAX requests for better performance?

A). Use synchronous requests

B). Use POST method for all requests

C). Minimize data transferred

D). Avoid using AJAX

How can you create a promise in jQuery?

A). Using the .then() method

B). Using the .done() method

C). Using the .promise() method

D). Using the .fail() method

What is the effect of using the .append() method inside a loop without caching?

A). Improved readability

B). Improved performance

C). Increased DOM manipulations

D). Reduced memory usage

What is the benefit of using the .when() method in jQuery?

A). To handle a single AJAX request

B). To handle multiple AJAX requests concurrently

C). To handle DOM manipulations

D). To handle event delegation

What is the purpose of the debounce function?

A). To improve animation performance

B). To limit the rate at which a function is executed

C). To improve event handling

D). To batch DOM changes

Which method detaches elements from the DOM in jQuery?

A). .remove()

B). .hide()

C). .detach()

D). .append()