Learn Lua in Neovim: Functions — Basics, Parameters vs Arguments & return | Episode 12

Stop repeating yourself — write it once and call it anywhere! In this episode we define functions with function/end, use return to send values back, and understand the difference between parameters (what the function expects) and arguments (what you pass when calling it). Every keystroke is shown on screen with 3-second pauses so you can follow along at your own pace. Source code: https://github.com/GoCelesteAI/learn-lua-in-neovim What You'll Learn: - function name(params)...end — how to define a function - return — sending a value back to the caller - Parameters vs arguments — definition vs call-site - greet(name) — a simple string-returning function - add(a, b) — arithmetic with two parameters - is_even(n) — returning a boolean result Timestamps: 0:00 Intro 0:12 Preview 0:44 Greet Function (function/end, parameters) 2:26 Add Function (return values) 4:11 Is Even Function (boolean returns) 5:52 Recap 6:24 Endscreen Key Takeaways: 1. function name(params)...end defines a reusable block 2. return sends a value back to the caller 3. Parameters are placeholders; arguments are real values 4. Functions can return any Lua value or nothing 5. Call a function with name(arg1, arg2) syntax This is Episode 12 of the Learn Lua in Neovim series. New episodes cover multiple returns, variadics, scope, and more — all coded inside Neovim. Taught by CelesteAI. Like & subscribe for more tutorials! #lua #neovim #programming #tutorial #beginners #learnlua #luaprogramming #neovimtutorial #luafunctions #luareturn #coding Tags lua, lua tutorial, learn lua, lua functions, lua function basics, lua function end, lua return, lua parameters, lua arguments, lua greet function, lua add function, lua is_even, lua define function, lua for beginners, neovim lua, neovim tutorial, learn lua in neovim, lua episode 12, programming tutorial, coding tutorial, beginner programming, lua 2026, neovim 2026, screenkey, code along, lua basics, lua reusable code