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JavaScript Bytes

Core JavaScript concepts every developer should know

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Create a LeanringByte9 bytes available

Core JavaScript concepts every developer should know

Frontend

Create a LeanringByte9 bytes available

2 min

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var vs. let vs. const

Learn about their unique scoping rules (function-scoped vs. block-scoped), redeclaration and reassignment behaviors, and hoisting nuances, including the Temporal Dead Zone. Master these fundamental concepts to write cleaner, more predictable, and robust JavaScript code.

Hoisting in JavaScript

Hoisting is JavaScript's behavior of moving variable and function declarations to the top of their scope during compilation.

Closures in JavaScript

Discover how functions can "remember" and access variables from their outer scope, even after that scope has closed. This byte simplifies closures with real-world examples, showing how they enable powerful patterns like data privacy, function factories, and maintaining state in async operations

Deep Copy vs. Shallow Copy

Shallow copies share nested data, so changes in one reflect in the other. Deep copies create independent duplicates. Object.assign makes shallow copies of nested objects, while structuredClone ensures a true deep copy. Essential for avoiding unexpected side effects!

Why 0.1 + 0.2 ≠ 0.3 in JavaScript

Why? JavaScript can't store decimal numbers exactly. It's like trying to write 1/3 as a decimal - you get 0.333333... forever. JavaScript stores 0.1 as something like 0.10000000000000001. The Cheat Code: Never use === for decimal comparisons. Use tolerance checking instead: Math.abs(a - b) < 0.0001.

JavaScript Proxy Objects

Think of it as a security guard for your objects! Proxy lets you intercept and customize operations (get, set, delete) performed on objects. Want to hide sensitive data? Validate inputs? Proxy is your friend!

Object.groupBy() - Array Method

Discover Object.groupBy, a new built-in JavaScript method (ES2024) that simplifies data grouping. Say goodbye to complex reduce function implementations for grouping elements. This byte demonstrates how Object.groupBy provides a clean, straightforward way to organize data based on specified criteria

Data Types in JavaScript

Learn the difference between primitive types (like numbers, strings, booleans) and non-primitive types (objects, arrays, functions). Understand how JavaScript handles different kinds of data, which is crucial for writing effective and error-free code.

Event Loop in JavaScript

Discover how this clever mechanism allows single-threaded JavaScript to handle asynchronous operations (like fetching data or timers) without freezing your browser. Learn about the Call Stack, Web APIs, and Callback Queue, and how they work together to keep your applications responsive and smooth.

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