Blog

Mert Özen's blog posts on software development, backend, frontend, and DevOps.

Series

.NET Core Web API 30 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12

2 posts found #scope

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Frontend PART 03

JavaScript Scope, Hoisting and Closures: Where Do Variables Live?

We learn global, function and block scope, the scope chain, how var, let, const and functions are hoisted, the TDZ, and closures through counters, private data and function factories, plus the closure-in-a-loop trap.

3 Nov 2026 9 min 4

Frontend PART 03

JavaScript Variables: let and const, Block Scope and the TDZ

We declare variables with let and const, and use examples to see reassignment versus mutation, block scope, naming rules, why var has been retired, and the TDZ.

3 Nov 2026 9 min 5