javascript - What is the function constructor in Node.js? -


in browser (chrome @ least) functions instances of function

settimeout instanceof function // true

however in node, not

settimeout instanceof function // false

so settimeout's constructor if not function?

it seems constructor function, 1 realm.

if run code

console.log(object.getownpropertynames(settimeout.constructor.prototype));

you array typical function.prototype methods call, apply , bind.

so guess it's analogous happens in web browsers when borrow settimeout iframe:

var iframe = document.createelement('iframe'); document.body.appendchild(iframe); var win = iframe.contentwindow; console.log(win.settimeout instanceof function);     // false console.log(win.settimeout instanceof win.function); // true

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