CODEWITHSUNDEEP
javascriptfunctionconstructorprototypeproto
jwkoo
jwkoo

Reputation: 2653

relationship between function and Function

I`m really wondering about the relationship between function and Function..

i read that article "function inherit the methods of Function", so can function use the methods like apply, bind, call, etc

so i checked in the console, using the code below.

function test(){} // statement
test.__proto__ // function(){[native code]}

ah.. if "function inherit the methods of Function" is true,
why is the outcome function(){[native code]}, not the function Function(){[native code]}?

also i`ve checked that the constructor of function test is function Function, even makes me confusing..

its so weird.. need some help..

Upvotes: 1

Views: 43

Answers (3)

Koushik Chatterjee
Koushik Chatterjee

Reputation: 4175

test is created using the constructor Function, what test__proto__.constructor will return

the prototype of test is function () { [native code] } from where is is inheriting (what test.__proto__), and that is why you are able to access test.<some property name> whose are actually property of function () { [native code] }

Upvotes: 1

t.niese
t.niese

Reputation: 40842

Both function test() {} and new Function(), output function ... and not Function ... in the console, so it is still consistent. That they do it this way is a historical reason, it reflects more what you normally see in the source code.

console.log(new Function() );
console.log(function test(){} );

Upvotes: 0

samanime
samanime

Reputation: 26547

a.__proto__ is the prototype.

a.__proto__.constructor is Function

function a() { }
console.log(a.__proto__);
console.log(a.__proto__ === Function);

console.log(a.__proto__.constructor);
console.log(a.__proto__.constructor === Function);

a.__proto__ is pretty much an anonymous function for initializing.

Upvotes: 2

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