Const in block areas in Node and Chrome (V8)

Question

I am writing a nodejs application (v4.2.4), I have detected some odd behavior.

function A(number) {
 this.number = number;
}

for(var i = 0; i < 3; i++) {
  const a = new A(i);

  console.log(a.number);
}

const b = new A(99);
console.log(b.number);

My intuition coming from Java (and one from FireFox) is that the output should have been

0
1
2
99

However node (and chrome) give me

0
0
0
99

I researched and understood from MSN - a block area that vardoes not have a block area in javascript. Looking further, MSN - const describes a const declaration as having a block scope:

Constants are block-like, like variables defined using the let statement. The value of the constant cannot be changed upon reassignment and cannot be updated.

, Node Chrome ( , , V8) const . ,

, , .

, V8 const , FireFox ? , - ?

Answer 1

v8 use strict, . : http://v8project.blogspot.ru/2016/01/v8-release-49.html

:

4.9 , ,

const

Answer 2

Chrome ES6. const, , ES6.

const Chrome , ES5 ( ), ES6.

: https://kangax.imtqy.com/compat-table/es6/

const .