Jul 17, 2025
diff --git a/1-js/09-classes/06-instanceof/article.md b/1-js/09-classes/06-instanceof/article.md
    For example:

    ```js run
    // setupinstanceOf check that assumes that
    // setupinstanceof check that assumes that
    // anything with canEat property is an animal
    class Animal {
      static [Symbol.hasInstance](obj) {
    alert(obj instanceof Animal); // true: Animal[Symbol.hasInstance](obj) is called
    ```

 2. Most classes do not have `Symbol.hasInstance`. In that case, the standard logic is used: `objinstanceOf Class` checks whether `Class.prototype` is equal to one of the prototypes in the `obj` prototype chain.
 2. Most classes do not have `Symbol.hasInstance`. In that case, the standard logic is used: `objinstanceof Class` checks whether `Class.prototype` is equal to one of the prototypes in the `obj` prototype chain.

    In other words, compare one after another:
    ```js
Original file line number	Diff line number	Diff line change
Expand Up		@@ -55,7 +55,7 @@ The algorithm of `obj instanceof Class` works roughly as follows:
		For example:

		```js run
		// setupinstanceOf check that assumes that
		// setupinstanceof check that assumes that
		// anything with canEat property is an animal
		class Animal {
		static [Symbol.hasInstance](obj) {
Expand All		@@ -68,7 +68,7 @@ The algorithm of `obj instanceof Class` works roughly as follows:
		alert(obj instanceof Animal); // true: Animal[Symbol.hasInstance](obj) is called
		```

		2. Most classes do not have `Symbol.hasInstance`. In that case, the standard logic is used: `objinstanceOf Class` checks whether `Class.prototype` is equal to one of the prototypes in the `obj` prototype chain.
		2. Most classes do not have `Symbol.hasInstance`. In that case, the standard logic is used: `objinstanceof Class` checks whether `Class.prototype` is equal to one of the prototypes in the `obj` prototype chain.

		In other words, compare one after another:
		```js
Expand Down