Commit 9909b90

committed

minor

1 parent 072fa7d commit 9909b90Copy full SHA for 9909b90

File tree

-2

lines changed

-2

lines changed

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
@@ -236,11 +236,11 @@ The short answer is: constructors in inheriting classes must call `super(...)`,
`236`	`236`
`237`	`237`	`Of course, there's an explanation. Let's get into details, so you'll really understand what's going on.`
`238`	`238`
`239`		-In JavaScript, there's a distinction between a "derived constructor" (constructor function of an inheriting class) and other functions. A derived constructor has a special internal property `[[ConstructorKind]]:"derived"`. In other words, the constructor function of a class that "extends" something bears a "special label".
	`239`	+In JavaScript, there's a distinction between a constructorfunction of an inheriting class (so-called "derived constructor") and other functions. A derived constructor has a special internal property `[[ConstructorKind]]:"derived"`. That's a special internal label.
`240`	`240`
`241`	`241`	That label affects its behavior with `new`.
`242`	`242`
`243`		-- When a regular function `F`is executed as `new F`, it creates an empty object and assigns it to `this`.
	`243`	+- When a regular function is executed with `new`, it creates an empty object and assigns it to `this`.
`244`	`244`	`- But when a derived constructor runs, it doesn't do this. It expects the parent constructor to do this job.`
`245`	`245`
`246`	`246`	So a derived constructor must call `super` in order to execute its parent (non-derived) constructor, otherwise the object for `this` won't be created. And we'll get an error.

Comments

(0)