Prototype Chains

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Prototype Chains

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Last edited Mar 23, 2017

Created on Mar 23, 2017

Prototype Chains demonstrates JavaScript’s prototype-based inheritance through a series of code excerpts. It shows property lookup behavior, including failed lookups returning `undefined`, and contrasts one-time copying with `extend()` against ongoing delegation using `Object.create()`. The example illustrates how a linked object (rose) delegates missing property lookups to its prototype (gold), while copied objects (blue) do not reflect later additions. It also introduces the object prototype, the top-level fallback providing shared methods like `toString` for all objects.

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