The function needed to be compliant with ES5, and the data was in this format:
const bob = [ { "bob": { "1.1": 11, "1.2": [ { "1.2.1": 121 }, { "1.2.2": 122 } ], "list": [ { "bob.1.1": 121 }, { "bob.1.2": 122 } ] } }, { "bob": { "2.1": 11, "2.2": [ { "2.2.1": 121 }, { "2.2.2": 122 } ], "list": [ { "bob.2.1": 121 }, { "bob.2.2": 122 } ] } }, { "bob": { "3.1": 11, "3.2": [ { "3.2.1": 121 }, { "3.2.2": 122 } ] } }, { "fred": { "4.1": 11, "4.2": [ { "4.2.1": 121 }, { "4.2.2": 122 } ], "list": [ { "bob.4.1": 121 }, { "bob.4.2": 122 }, { "bob.4.3": 122 } ] } }, { "bob": { "5.1": 11, "5.2": [ { "5.2.1": 121 }, { "5.2.2": 122 } ], "list": [ { "bob.5.1": 121 }, { "bob.5.2": 122 }, { "bob.5.3": 122 }, { "bob.5.4": 122 } ] } }, { "bob": { "6.1": 11, "6.2": [ { "6.2.1": 121 }, { "6.2.2": 122 } ], "list": [ { "bob.6.1": 121 } ] } } ] Only the list was required from objects called bob.
I was restricted to using ES5, so I came up with this:
const bobs = bob.reduce(function(a, c) { if (!!c.bob && !!c.bob.list) { Array.prototype.push.apply(a, c.bob.list) } return a }, []) console.log(bobs.length) 
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