File: group6.js

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mongodb 1%3A2.0.6-1.1
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t = db.jstests_group6;
t.drop();

for( i = 1; i <= 10; ++i ) {
    t.save( {i:new NumberLong( i ),y:1} );
}

assert.eq.automsg( "55", "t.group( {key:'y', reduce:function(doc,out){ out.i += doc.i; }, initial:{i:0} } )[ 0 ].i" );

t.drop();
for( i = 1; i <= 10; ++i ) {
    if ( i % 2 == 0 ) {
        t.save( {i:new NumberLong( i ),y:1} );
    } else {
        t.save( {i:i,y:1} );
    }
}

assert.eq.automsg( "55", "t.group( {key:'y', reduce:function(doc,out){ out.i += doc.i; }, initial:{i:0} } )[ 0 ].i" );

t.drop();
for( i = 1; i <= 10; ++i ) {
    if ( i % 2 == 1 ) {
        t.save( {i:new NumberLong( i ),y:1} );
    } else {
        t.save( {i:i,y:1} );
    }
}

assert.eq.automsg( "55", "t.group( {key:'y', reduce:function(doc,out){ out.i += doc.i; }, initial:{i:0} } )[ 0 ].i" );

assert.eq.automsg( "NumberLong(10)", "t.group( {$reduce: function(doc, prev) { prev.count += 1; }, initial: {count: new NumberLong(0) }} )[ 0 ].count" );