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[
{name:1, val:{val:null}},
{name:2, val:{val:1}},
{name:3, val:{val:2}},
{name:4, val:{val:null}},
{name:5, val:{val:7}},
].reduce((x,y)=>x+(y.val.val||0), 0) / [
{name:1, val:{val:null}},
{name:2, val:{val:1}},
{name:3, val:{val:2}},
{name:4, val:{val:null}},
{name:5, val:{val:7}},
].filter(c=>c.val.val).length
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