Assign two variables to the same value with one expression? [duplicate]

Answer 1

You can do this way .. But my suggest try to avoid it.

var one, two, three;
one = two = three = "";

Answer 2

var x = y = 'hi';
alert('x'+x);
alert('y'+y);

Fiddle

Answer 3

Yes, it is possible:

let x, y;
x = y = 'hi';

It is called chaining assignment, making possible to assign a single value to multiple variables.
See more details about assignment operator.

---

If you have more than 2 variables, it's possible to use the array destructing assignment:

let [w, x, y, z] = Array(4).fill('hi');

Answer 4

That's expected behavior. From the EMCA-262 6th edition:

If a LexicalBinding in a let declaration does not have an Initializer the variable is assigned the value undefined when the LexicalBinding is evaluated.

Answer 5

There is absolutely no reason to prefer the destructuring assignment over simply

let x = 'hi', y = x;

Not only it's one statement instead of two, but it also avoids extra allocations (the provided solution with destructuring allocates at least one object with no good reason).