elements-added-after.js

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// |reftest| skip-if(!this.hasOwnProperty("Tuple"))

var tupleIndex = -1;

var originalLength = 7;

var obj = {

  length: originalLength,

  0: 2,

  1: 4,

  2: 8,

  3: 16,

  4: 32,

  5: 64,

  6: 128

};

var tuple = #[2, 4, 8, 16, 32, 64, 128];

function mapFn(value, index) {

    tupleIndex++;

    assertEq(value, obj[tupleIndex]);

    assertEq(index, tupleIndex);

    obj[originalLength + tupleIndex] = 2 * tupleIndex + 1;

    return obj[tupleIndex];

var t = Tuple.from(obj, mapFn);

assertEq(t, tuple);

reportCompare(0, 0);