Effective JavaScript
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This document provides an overview of effective JavaScript techniques including: - Using closures to reduce typing, clean up code, provide privacy and sometimes improve performance. - Building objects with closures and avoiding unnecessary methods like bind in asynchronous operations. - Using object literals and shortcuts to make objects more inspectable and avoid unnecessary property accesses. - Tips for interacting with the DOM like avoiding closures that reference nodes and using references over lookups. - New features in ECMAScript 5 like Function.prototype.bind and getters/setters. - Optimizations in v8 like avoiding delete, using object literals, and not altering objects after creation.
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Effective JavaScript
Editor's Notes
- #12: No block scope. In general you reference enclosing functions and their arguments until you reach the global scope. With is an exception.
- #13: This isn’t as true in v8.
- #14: Referencing a is 4 steps away!
- #15: If something isn’t defined in the object in your with statement, you create a global. If it is, you overwrite that property. It’s difficult to tell from reading the code how an assignment might affect the program.
- #19: And you can combine the two!
- #20: This avoids a step on the scope chain.
- #21: Minimize your code, don’t keep functions around that are one-offs. On the other hand, this function is recreated every time.
- #22: As always with closures, watch for memory leaks.
- #31: Be careful though, unlike other languages with getters and setters, Javascript won’t warn you if you access an undefined property. It’ll just return undefined.