JavaScript Scope Challenge: IIFE & var — Predict the Output! (Beginner → Expert)
0:57
YouTubeThe developer school
JavaScript Scope Challenge: IIFE & var — Predict the Output! (Beginner → Expert)
In this video we break down a classic JavaScript scope trap step-by-step. Start with a simple snippet: function run(){ { (function(){ var x = 1; var y = 2; })() } console.log(x, y) } run(); Predict the output — then watch as we gradually increase difficulty and modify the code to teach var vs let/const, hoisting, IIFEs, global leaks, closures ...
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