Array.concat breaks when extending the Array to custom class using ES6 classes #19314
Description
- Version: 8.9.3
- Platform: Ubuntu 16.04 64-bit
class MyArray extends Array {};
let myArray = new MyArray(6);
myArray = myArray.concat(new MyArray(5));
let array = new Array(6);
array = array.concat(new Array(5));
console.log('myArray length: ', myArray.length);
console.log('array length: ', array.length);Actual output:
myArray length: 0
array length: 11
Expected output:
myArray length: 11
array length: 11
FEW NOTES:
- Actual and expected output match when run with
node v10.0.0-pre - Actual and expected output match when run in the chrome V8 console