Glossary Term
Object.isExtensible()
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The Object.isExtensible() static method determines if an object is extensible (whether it can have new properties added to it).
Objects are extensible by default: they can have new properties added to them, and their [[Prototype]] can be re-assigned. An object can be marked as non-extensible using one of Object.preventExtensions(), Object.seal(), Object.freeze(), or Reflect.preventExtensions().
Return value: A Boolean indicating whether or not the given object is extensible.
Syntax example: Object.isExtensible(obj)
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