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// SERVER-18222: Add $isArray aggregation expression.
(function() {
'use strict';
var coll = db.is_array_expr;
coll.drop();
// Non-array types.
assert.writeOK(coll.insert({_id: 0, x: 0}));
assert.writeOK(coll.insert({_id: 1, x: '0'}));
assert.writeOK(coll.insert({_id: 2, x: new ObjectId()}));
assert.writeOK(coll.insert({_id: 3, x: new NumberLong(0)}));
assert.writeOK(coll.insert({_id: 4, x: {y: []}}));
assert.writeOK(coll.insert({_id: 5, x: null}));
assert.writeOK(coll.insert({_id: 6, x: NaN}));
assert.writeOK(coll.insert({_id: 7, x: undefined}));
// Array types.
assert.writeOK(coll.insert({_id: 8, x: []}));
assert.writeOK(coll.insert({_id: 9, x: [0]}));
assert.writeOK(coll.insert({_id: 10, x: ['0']}));
// Project field is_array to represent whether the field x was an array.
var results = coll.aggregate([
{$sort: {_id: 1}},
{$project: {isArray: {$isArray: '$x'}}},
])
.toArray();
var expectedResults = [
{_id: 0, isArray: false},
{_id: 1, isArray: false},
{_id: 2, isArray: false},
{_id: 3, isArray: false},
{_id: 4, isArray: false},
{_id: 5, isArray: false},
{_id: 6, isArray: false},
{_id: 7, isArray: false},
{_id: 8, isArray: true},
{_id: 9, isArray: true},
{_id: 10, isArray: true},
];
assert.eq(results, expectedResults);
}());
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