Is there a way to rewrite the descriptor of length in the JS array?

is there a way to rewrite the descriptor of length in the js array

in js, the array length already has a default descriptor, and configurable is false, so there is no way to override it. Since I want to see if length is cached during the loop (using the length attribute to end a restriction), I want to override the gettet test of length

related codes

/ / Please paste the code text below (do not replace the code with pictures) 

for (let i = 10; i < arr.length; iPP) {
    //arr.lengthlength
}

I wonder whether the length will be cached inside the browser, and whether the loop will only call length once and then use a cache value for all subsequent loops

Javascript
Apr.18,2022

of course not cached. 

var array = [0, 1, 2, 3];
for (let i = 0; i < array.length; iPP) {
  if (array.length < 10) {
    array.push(4);
  }
  console.log(i)
}

this code proves it.

arrays are also objects, so this code can also prove 

var obj = {}
Object.defineProperty(obj, 'length', {
  get: function () {
    console.log('x');
    return 4;
  }
})

for (var i = 0; i < obj.length; iPP) {
  
}
The

obj.length property is not cached and is read every time

Previous: Why is the status code returned by the image requested by base64 for the first time 200 (from memory cache)?

Next: Https problem

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
© 2021 CodesHelper
Advertising Contact us About us
Menu