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miworld

Question about isPlainObject method

in Developing jQuery Core • 5 years ago

from the source code: "return typeof Ctor === "function" && toString.call( Ctor ) === ObjectFunctionString;"

jQuery. isPlainObject ( {} ) // true
jQuery. isPlainObject ( new Object ) // true

but i don't understand this situation:

function Ctor(){

}

jQuery. isPlainObject (new Ctor); // true

because toString.call( Ctor ) === ObjectFunctionString // this should is false.but result is true

Replies(4)

jakecigar

Re: Question about isPlainObject method

5 years ago

$.isPlainObject(new Ctor) === false

Can you make a demo that shows it to be true?

JΛ̊KE

Anuraj

Re: Question about isPlainObject method

5 years ago

The below code

toString.call( Ctor ) === ObjectFunctionString

seems to be expensive, so can we change ' toString.call( Ctor )' to 'Ctor.name' which is just accessing the property and check with ({}).constructor.name.

This will definitely boost performance atleast 3X times faster than existing condition check.

Given the jsbin link to check the performance. Please let me know whether this one can be implement in jquery. So that i can raise ticket and put the fix.

Link to the demo