[RESEARCH] Javascript/operator : delete

[developerasun]

topic : understanding delete operator in Javascript

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The JavaScript delete operator removes a property from an object; if no more references to the same property are held, it is eventually released automatically.

Unlike what common belief suggests (perhaps due to other programming languages like delete in C++), the delete operator has nothing to do with directly freeing memory. Memory management is done indirectly via breaking references. See the memory management page for more details.

const Employee = {
  firstname: 'John',
  lastname: 'Doe'
};

console.log(Employee.firstname);
// expected output: "John"

delete Employee.firstname;

console.log(Employee.firstname);
// expected output: undefined

reference

• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete