Glossary Term
Object.isSealed()
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The Object.isSealed() static method determines if an object is sealed.
Returns true if the object is sealed, otherwise false. An object is sealed if it is not extensible and if all its properties are non-configurable and therefore not removable (but not necessarily non-writable).
Return value: A Boolean indicating whether or not the given object is sealed.
Syntax example: Object.isSealed(obj)
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