Ramda, filter with or condition - ramda.js

Question

let arr = [
{
name: 'Anna',
q: {
name: 'Jane'
}
}
];
const getName = R.prop('name');
const getQname = R.path(['q','name']);
A filter where any of these two functions passes.
Something like:
export const filterByName = (name) =>
R.filter(
R.or(
R.propEq(getName, name),
R.propEq(getQname, name)
)
)
Not working. How can I combine these two functions in a R.filter?

Answer 1

Use R.either with R.propEq for the name and R.pathEq from q.name:
const filterByName = (name) =>
R.filter(
R.either(
R.propEq('name', name),
R.pathEq(['q', 'name'], name)
)
)
const arr = [{"name":"Anna","q":{"name":"Jane"}},{"name":"Smite","q":{"name":"Jane"}},{"name":"Another","q":{"name":"One"}}];
console.log(filterByName('Anna')(arr))
console.log(filterByName('Jane')(arr))
console.log(filterByName('XXX')(arr))
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.js"></script>
If you want to use an external function to extract the values, you can use R.pipe. Extract all property values with R.juxt, and then use R.any with R.equal to check for equality.
const getName = R.prop('name');
const getQname = R.path(['q','name']);
const filterByName = (name) =>
R.filter(
R.pipe(
R.juxt([getName, getQname]), // get all names
R.any(R.equals(name)) // check if any of the equals to name
)
)
const arr = [{"name":"Anna","q":{"name":"Jane"}},{"name":"Smite","q":{"name":"Jane"}},{"name":"Another","q":{"name":"One"}}];
console.log(filterByName('Anna')(arr))
console.log(filterByName('Jane')(arr))
console.log(filterByName('XXX')(arr))
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.js"></script>

Answer 2

I would use either as it works with functions:
export const filterByName = (name) =>
R.filter(R.either(
R.propEq('name', name),
R.pathEq(['q', 'name'], name)));
or
const nameIs = R.propEq('name');
const qNameIs = R.pathEq(['q','name']);
export const filterByName = (name) =>
R.filter(R.either(nameIs(name), qNameIs(name)));

Answer 3

You could also write this in a point free style:
const nameIs = R.converge(R.or, [
R.pathEq(['name']),
R.pathEq(['q', 'name']),
]);
const onlyAnna = R.filter(nameIs('Anna'));
const onlyGiuseppe = R.filter(nameIs('Giuseppe'));
const data = [
{ name: 'Anna', q: { name: 'Jane' } },
{ name: 'Mark', q: { name: 'Mark' } },
{ name: 'Giuseppe', q: { name: 'Hitmands' } },
];
console.log('Anna', onlyAnna(data));
console.log('Giuseppe', onlyGiuseppe(data));
<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1/ramda.js"></script>