[PDF] JavaScript - Object.defineProperties

Writable Attribute

When the writable property attribute is false, the property is said to be "non-writable". It cannot be reassigned. Trying to write to a non-writable property doesn't change it and results in an error in strict mode.

Enumerable Attribute

The enumerable property attribute defines whether the property is considered by Object.assign() or the spread operator. For non-Symbol properties, it also defines whether it shows up in a for...in loop and Object.keys() or not. For more information, see Enumerability and ownership of properties.

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What is a property in JavaScript?

The object on which to define or modify properties. An object whose keys represent the names of properties to be defined or modified and whose values are objects describing those properties. Each value in props must be either a data descriptor or an accessor descriptor; it cannot be both (see Object.defineProperty () for more details).

What is the difference between object and defineproperties?

On the other hand, Object.defineProperties takes the target object, and another object whose every key is a property name and every value is the corresponding descriptor, which allows to define multiple properties at once.

What is defineproperties() method in Java?

The Object.defineProperties () method adds or modifies properties on an object and returns the object. Here, defineProperties () is a static method. Hence, we need to access the method using the class name, Object. obj - the object on which to define or modify properties.

What does defineproperties() do?

The defineProperties () method returns the object that was passed as an argument i.e. obj. Note: If a descriptor doesn't contain any of the value, writable, get and set keys, then it is treated as a data descriptor. An exception is thrown if a descriptor has both value or writable and get or set keys.

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