dotNotationPopulate

dotNotationPopulate.js

// Ecmascript 5

function dotNotationPopulate(text) {

  function findPopulate(obj, level, index) {
    var index = index || 1;
    if (level === index || !obj.populate) {
      return obj;
    }
    return findPopulate(obj.populate, level, index + 1);  
  }

  var splitted = text.split('.');
  
  return splitted
    .map(function(item, index, list) {
      if (index+1 === list.length) {
        return { path: item }
      } else {
        return { path: item, populate: {} }
      }
    })
    .reduce(function(mem, curr, index, list) {
      var populate = findPopulate(mem, index);
      populate.populate = curr;
      return mem;
    });
}

// Ecmascript 6

const dotNotationPopulate = (text) => {

  const findPopulate = (obj, level, index = 1) => {
    if (level === index || !obj.populate)
      return obj;
    return findPopulate(obj.populate, level, index + 1);  
  }

  const splitted = text.split('.');
  
  return splitted
    .map((item, index, list) => {
      if (index + 1 === list.length)
        return { path: item };
      else
        return { path: item, populate: {} };
    })
    .reduce((mem, curr, index) => {
      const populate = findPopulate(mem, index);
      populate.populate = curr;
      return mem;
    });
}