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Javascript

[JS] Export v.s. Import Modules

[JS] Export v.s. Import Modules

What to Expect from This Post In this post, we’ll learn how to export and import variables between files in JavaScript using ES Modules (ESM). This is essential for writing modular, organized, and maintainable code. Folder Setup Example Let’s say we’re working with the following three files:

[JS] Intersection Observer API

[JS] Intersection Observer API

What’s the issue I spotted? While browsing modern websites, I noticed a common yet impressive feature: as I scroll to specific sections, those sections animate into view, and the corresponding item in the navigation bar becomes highlighted. This subtle interaction enhances the user experience dramatically. But that led me

[Leetcode] JS 30 Debounce

[Leetcode] JS 30 Debounce

Question Given a function fn and a time in milliseconds t, return a debounced version of that function. A debounced function is a function whose execution is delayed by t milliseconds and whose execution is cancelled if it is called again within that window of time. The debounced function should

[Leetcode] JS 30 Cache With Time Limit

[Leetcode] JS 30 Cache With Time Limit

Question Write a class that allows getting and setting key-value pairs, however a time until expiration is associated with each key. The class has three public methods: set(key, value, duration): accepts an integer key, an integer value, and a duration in milliseconds. Once the duration has elapsed, the key

[Leetcode] JS 30 Promise Time Limit

[Leetcode] JS 30 Promise Time Limit

Question Given an asynchronous function fn and a time t in milliseconds, return a new time limited version of the input function. fn takes arguments provided to the time limited function. The time limited function should follow these rules: * If the fn completes within the time limit of t milliseconds,

[Leetcode] JS 30 Sleep

[Leetcode] JS 30 Sleep

Question Given a positive integer millis, write an asynchronous function that sleeps for millis milliseconds. It can resolve any value. Example 1: Input: millis = 100 Output: 100 Explanation: It should return a promise that resolves after 100ms. let t = Date.now(); sleep(100).then(() => { console.log(Date.now() -

[JS] What are reference types?

[JS] What are reference types?

Key Learnings of This Post * Understand what reference types are in javascript and their characteristics. What are reference types? In JavaScript, reference types (also called non-primitive types) are values that are stored in memory by reference, rather than directly containing their value. When you assign or compare a reference type,