One-way sharing in JavaScript objects

When looking up the value of a property, JavaScript first looks at the properties that the object itself has. If there is a property that has the name we are looking for, that is the value we get. If there is no such property, it continues searching the prototype of the object, and then the prototype of the prototype, and so on. If no property is found, the value undefined is given. On the other hand, when setting the value of a property, JavaScript never goes to the prototype, but always sets the property in the object itself.

Eloquent JavaScript

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