OBSOLETE

The block version of the let statement was dropped from ES6 before it was finalized, and it has been removed from the browsers that supported it. This question is now only of historic interest.

Is there any difference between using an ECMAScript 6 let block statement and using a with statement with an equivalent object literal?

using let statement

var x = 10;
let (x = x * 10,
     y = x + 5) {
    console.log("x is " + x + ", y is " + y);
}

using with statement

var x = 10;
with ({x: x * 10,
       y: x + 5}) {
    console.log("x is " + x + ", y is " + y);
    // writes "x is 100, y is 15"
}