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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