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Its connection with the object is severed, and it usually doesn’t work properly anymore.
Most modern Java Script engines optimize the performance of instances created by constructors if their “shape” doesn’t change (roughly: no properties are removed or added). Therefore, you need the bracket operator (shown in the following example) to access properties whose keys are numbers: Object literals also allow you to use arbitrary strings (that are neither identifiers nor numbers) as property keys, but you must quote them.
Each new layer only depends on prior ones, enabling you to learn Java Script OOP incrementally.
Layers 1 and 2 form a simple core that you can refer back to whenever you are getting confused by the more complicated layers 3 and 4.
If you want to read or write properties with arbitrary names, you need to use the bracket operator (see Bracket Operator (): Accessing Properties via Computed Keys). As a preparation, we create one property that can be deleted and another one that can’t be deleted (Getting and Defining Properties via Descriptors explains Numbers can be used as property keys in object literals, but they are interpreted as strings.
The examples in this section work with the following object: operator sparingly. The dot operator can only access properties whose keys are identifiers.
The specification writes the keys of internal properties in brackets. But they are more than that: they are real general-purpose objects.For example, you can use inheritance between objects (see Layer 2: The Prototype Relationship Between Objects), and you can protect objects from being changed.