rdma.js

myData.map(fixName);
function fixName(person) {
  return Object.assign({}, person, {
    name: person.name.replace(/John/g, "Ben")
  });
}

// inline function

myData.map(function fixName(person) {
  return Object.assign({}, person, {
    name: person.name.replace(/John/g, "Ben")
  });
});

// use R.replace instead String.prototype.replace

myData.map(function (person) {
  return Object.assign({}, person, {
    name: R.replace(/John/g, "Ben")(person.name)
  });
});

// Use 
// R.evolve({prop: fn})(item)
// instead
// Object.assign({}, item, {prop: fn(item['prop'])})

myData.map(function (person) {
  return R.evolve({
    name: R.replace(/John/g, "Ben")
  })(person);
});

// f(x => u(x)) == f(u)

myData.map(R.evolve({
    name: R.replace(/John/g, "Ben")
}));

// use R.map instead Array.prototype.map

R.map(R.evolve({
    name: R.replace(/John/g, "Ben")
}))(myData);

// or separately
var fixName = R.replace(/John/g, "Ben");
var fixPersonName = R.evolve({ name: fixName });
var fixNames = R.map(fixPersonName);
var fixedData = fixNames(myData);