Transform object to object where "equal" property exists to the value of "equal" - lodash

Question

I have a deep object like cats below, and I'm looking for a simple way to remove all properties deeply where the nested property is set to equal.
const cats = {
love: {
meow: {
equal: 2,
},
dolphin: {
hi: 'meow',
},
doggo: true,
soup: undefined,
vampire: {},
deep: {
ocean: {
love: {
equal: 'hi',
},
},
},
},
};
To this:
const cats = {
love: {
meow: 2,
deep: {
ocean: {
love: 'hi',
},
},
},
};

Answer 1

You can use a recursive _.transform():
const cats = {
love: {
meow: {
equal: 2,
},
dolphin: {
hi: 'meow',
},
doggo: true,
soup: undefined,
vampire: {},
deep: {
ocean: {
love: {
equal: 'hi',
},
},
},
},
};
const fn = (collection) => _.transform(collection, (r, v, k) => {
if(_.isArray(v)) r[k] = fn(v);
else if (_.isObject(v)) {
if(_.has(v, 'equal')) r[k] = _.get(v, 'equal');
else {
const value = fn(v);
if(!_.isEmpty(value)) r[k] = value;
}
} else if(!_.isUndefined(v)) r[k] = v;
});
const result = fn(cats);
console.log(result);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

Answer 2

Using #OriDori's answer I customized it to not set empty / unwanted props.
const fn = collection => lodash.transform(collection, (r, v, k) => {
if (lodash.isPlainObject(v)) {
if (lodash.has(v, 'equal')) {
r[k] = lodash.get(v, 'equal');
} else {
const d = fn(v);
if (lodash.size(d)) {
r[k] = d;
}
}
}
});