Bug 506358

Description Michael Rennie 2016-10-21 11:54:35 EDT

Consider the following examples of destructuring array assignments. Occurrences does not work properly for any of the identifiers in the LHS of the assignment expression.

//Simple
var [a, b] = [1, 2];
if(a === 10 || b === 10) {
}

//External decl
var c, d;
[c, d] = [3, 4];
if(c === 10 || d === 10) {
}

//Reassignment
var e = [5, 6];
var [f, g] = e;
if(f === 10 || g === 10) {
}

//Default values
var [h=1, i=2] = [3, 4];
if(h === 10 || i === 10) {
}

//Value swap
var j = 2, k = 3;
[j, k] = [k, j];

//Ignoring values
[l, ,n] = [1, 2, 3, 4, 5];
if(l === 10 || n === 10) {
}

Now consider the following examples of object destructuring assignment:

/*eslint-env browser */
//Simple
var {a, b} = {a: 1, b:2};
if(a || b) {
}

//Assign without decl
var c, d;
({c, d} = {c:1, d:2});

//Default values
var {e=10, f=5} = {e: 3};

//Function defaults
(function fun({aa = 1, bb = { x: 0, y: 0 }, cc = 2} = {}) {
  console.log(aa, bb, cc);
})();

//For of
var g = {aaa: 'a', bbb: {ccc: 'b'}};
for (var {aaa: a1, bbb: { ccc: c1 } } of g) {
  console.log(a1, c1);
}

//Computed property names
let key = "z";
let { [key]: h } = { z: "bar" };