for-in-replace-sparse.js

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// Array with sparse element (because non-writable).

var arr = [];

Object.defineProperty(arr, 0, {writable: false, configurable: true, enumerable: true, value: 0});

for (var p in arr) {

  // Replace sparse element with dense element.

  assertEq(p, "0");

  delete arr[0];

  arr[0] = 0;

  arr[1] = 1;

  arr.reverse();