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Variables

Coding tips and build notes by Mahir Faysal, a student web developer in Bangladesh: tested Python, HTML, CSS, JavaScript and PHP tutorials, plus notes from my Next.js and Gemini projects. Sample posts are marked and drafts stay in the admin area.

All notes Coding tips · 77 Learning notes · 4 Practice · 1

Coding tips

var vs let vs const in JavaScript: Differences, Hoisting and When to Use Each (Tested Examples)

var is function-scoped and hoisted as undefined; let and const are block-scoped and throw if used before their declaration. const stops reassignment, not mutation. Tested examples of scope, hoisting, the temporal dead zone, loops, globals and every related error message.

October 12, 2026 · 13 min read · 1 view

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