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mongo/jstests/core/query/undefined_array_elements.js

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var t = db[jsTestName()];
/* eslint-disable no-sparse-arrays */
var s0 = [, , 3, , , 6];
t.coll.insert({mys: s0});
var cur = t.coll.find();
var doc = cur.next();
assert.eq(6, doc['mys'].length);
assert.eq(undefined, doc['mys'][0]);
assert.eq(undefined, doc['mys'][1]);
assert.eq(3, doc['mys'][2]);
assert.eq(undefined, doc['mys'][3]);
assert.eq(undefined, doc['mys'][4]);
assert.eq(6, doc['mys'][5]);