for-in-densified-elements.js

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function test() {

    // An array with sparse elements...

    var arr = [];

    arr[10_000] = 1;

    arr[10_001] = 1;

    for (var prop in arr) {

        assertEq(prop, "10000");

        assertEq(arr.length, 10_002);

        // Densify the elements.

        for (var i = 0; i < arr.length; i++) {

            arr[i] = 1;

        // Delete the last dense element (10001). It should not be visited by the

        // active for-in (checked above).

        arr.length = 10_001;

test();