javascript-tutorial / javascript-tutorial/en.javascript.info

The arrow function.... The lookup of this is made exactly the same way as a regular variable search: in the outer lexical environment.

Offen
#2,813 1 Kommentar 0 Reaktionen 0 zugewiesene Personen Auf GitHub ansehen
Vorherrschende Sprache
HTML
Sterne
25.5k
Forks
4k
PR-Merge-Kennzahlen
Keine gemergten PRs in 30 T.

Beschreibung

I have tried to test this, i believe arrow function doesn't look up for 'this', in the outer lexical environment, it remembers the 'this' of the place where it is defined.
In the below code: arrow function is passed to another function and that function calls the arrow function at line //**. At line //** 'this' is 'window', so if arrow function looks up for this in outer lexical environment, then 'this' should be window object, not cl_Test.
Hence, i believe the statement put by you in arrow functions revisited should be changed. Please correct me if i am wrong.

    function cl_Test() {

// let name = 'Pradeep';
this.name = 'Pradeep';
this.age = '31';

this.arrowF = () => {
console.log(`${this.name + ' ' + this.age}`);
};
this.normalF = function () {
console.log(name)
};
this.arrowF2 = () => {
console.log(name);
}
};

function fTest(f1) {
f1(); // **
};

let o1 = new cl_Test();
o1.name = 'Sunil';
o1.age = '34';

fTest(o1.arrowF); //*
fTest(o1.normalF);
fTest(o1.arrowF2);

Beitragsleitfaden

Für dieses Repository ist kein Beitragsleitfaden indexiert

Rechercherichtung

Start by reading the “arrow functions revisited” section referenced in the issue and compare its statement about how arrow functions obtain this with the supplied example. Verify the behavior of arrowF and normalF when passed to fTest, then update the explanation so it accurately describes lexical this.】【。

Vom Indexierungsmodell aus dem Issue-Text verfasst.

Bewertung

Tech-Stack
javascript
Bereich
documentation
Issue-Typ
Dokumentation
Schwierigkeit
2/5
Geschätzter Aufwand
1-3 Stunden
Aktivitätsstatus
Veraltet
Klarheit
Größtenteils klar
Anfängerfreundlichkeit
35/100

Neue Issues direkt in Ihr Postfach

Eine kurze Übersicht über anfängerfreundliche GitHub-Issues.