Why Is Javascript's Constructor Property Not as Significant as You Might Think?

What is the True Significance of Javascript's Constructor Property?

Understanding Constructor and Prototype

Javascript's constructor property does not directly affect the constructor called during object creation. It merely records which function was used with the new operator to initialize the object.

The prototype property, in contrast, plays a crucial role in object lookups. If a property is not found on the object itself, Javascript checks .__proto__. If it's still not found, it continues up the prototype chain.

The Constructor Property

Setting Bar.prototype.constructor = Bar makes the Bar.prototype object appear as if it were created by Bar rather than Foo. This is not recommended and goes against Javascript's idiomatic usage.

Conclusion

Avoid the confusion surrounding inheritance in Javascript. Focus on interfaces and mixins instead of trying to force a classical inheritance model onto the prototype-based system. Checking for specific properties is more reliable than checking object types. Manual assignment of the constructor property is not common practice in idiomatic Javascript.

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