The Variable Crimes We Commit Against JavaScript
summary
Shows concrete JavaScript behavior with code: uses immediately‑invoked functions and console.log to prove var bubbles to function scope (examples produce 14 from a parent variable, 15 from an implicit global), demonstrates hoisting splitting declarations so a local var logs undefined before assignment (19/20 example), proves arrays/objects are passed by reference, and contrasts ES6: let scopes to blocks and const forbids reassign but allows mutation. Slides and runnable snippets back every claim.
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chapters (9)
- 0:00Start
- 0:43The Variable Crimes We Commit against Javascript
- 2:24Immediately Invoked Anonymous Functions
- 11:14Variable Hoisting
- 13:29Function Hoisting
- 22:37Javascript Error
- 22:58Code Locks in Es6
- 26:34Variable Shadowing
- 29:16Make Functions Perform Faster
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