JS: Iterator (Abstract class)

What is the Keyword “Iterator”

Iterator is the value of the property key "Iterator" of the Global Object .

console.log(globalThis["Iterator"] === Iterator);

Type

Type of Iterator is a function.

console.log(typeof Iterator === "function");

Parent

Parent of Iterator is Function.prototype.

console.log(Reflect.getPrototypeOf(Iterator) === Function.prototype);

Purpose

Has property Iterator.prototype that is the parent of all builtin Iterator, so Iterable Object can directly use methods like forEach, map, etc.

Properties

• JS: Iterator.prototype

• from

• length
• name

console.log(  Reflect.ownKeys( Iterator ) )
// [ "length", "name", "prototype", "from" ]

console.log( Iterator.from )
// [Function: from]

console.log( Iterator.length === 0)
// true

console.log( Iterator.name === "Iterator")
// true