function isPalindrome(str) const cleanStr = str.toLowerCase().replace(/[^a-z0-9]/g, ""); const reversedStr = cleanStr.split("").reverse().join(""); return cleanStr === reversedStr; console.log(isPalindrome("A man, a plan, a canal, Panama")); // Output: true Use code with caution. Removing Array Duplicates
Holds callbacks originating from setTimeout , setInterval , setImmediate , and standard DOM events.
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Both debouncing and throttling are optimization techniques used to limit the rate at which a function is executed. They are essential for handling high-frequency events like browser window resizing, scrolling, or real-time search inputs. Debouncing happy rawat javascript interview questions pdf free upd
Holds setTimeout , setInterval , and I/O operations. Execution Order Challenge javascript
: Essential topics like data types, the difference between var , let , and const , and the role of the JavaScript engine.
Searching for the latest Happy Rawat JavaScript Interview Questions PDF function isPalindrome(str) const cleanStr = str
Created when your script runs. It establishes the global object ( window in browsers) and the this keyword.
JavaScript is a single-threaded language, meaning it can execute only one piece of code at a time. It achieves non-blocking asynchronous behavior via the .
When an asynchronous task completes (like a setTimeout timer expiring or a fetch promise resolving), its corresponding callback function is placed into an execution queue. The Event Loop's job is to continually monitor the Call Stack. If the Call Stack is empty, it pushes the next pending callback onto the stack to be executed. They are essential for handling high-frequency events like
: Over 50 questions focusing on real-world coding challenges and "tricky" outputs.
If you hesitated on any of those, Go build a tiny to-do app in vanilla JS first.
6. What is Polyfilling? Write a Polyfill for Array.prototype.map .