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Basic Example:

const double = x => x * 2;
R.map(double, [1, 2, 3]); //=> [2, 4, 6]
R.map(double, {x: 1, y: 2, z: 3}); //=> {x: 2, y: 4, z: 6}

Intermediate Example:

const person = {
    "person": {
      "id": "1",
      "name": "John Doe",
      "hours": {
        "edges": [
          {
            "node": {
              "id": "1",
              "number": 8
            }
          },
          {
            "node": {
              "id": "2",
              "number": 7
            }
          }
        ]
      }
    }
};
// This function extracts the of number hours from a contact ands maps it into an array
function monthlyWorked(data) {
const setHour = (hour) => hour.node.number;
const hours = R.map(setHour, data.person.hours.edges);
return hours;
}
console.log(monthlyWorked(person)); // [8,7]

Advanced Example:

const contact = {
    "contact": {
      "id": 1,
      "name": "Name",
      "keywords": {
        "edges": [
          {
            "node": {
              "id": "1",
              "keyName": "Key1"
            }
          },
          {
            "node": {
              "id": "2",
              "keyName": "Key2"
            }
          }
        ]
      }
    }
}
function getKeywords(keywords) {
const keywordsEdges = R.propOr([], 'edges', keywords,); // Sets an empty array on edges of keywords that are empty
return R.pluck('node', keywordsEdges); // Removes the node property from keywords
}
function formatContact(data) {
const setContact = (value, key) => key === 'keywords' ? R.pluck('id', getKeywords(value)) : value;
const formattedContacts = R.mapObjIndexed(setContact, data.contact);
return formattedContacts;
}
console.log(formatContact(contact));

This example extracts keywords.edges.nodes from keywords and sets them into an array. Reformats the Contact so that the keywords property is set as the previous array.