Deletes empty values from an Object or Array

removeEmpty.js

var removeEmpty = (() => {
  /**
   * Determines if the entry parameter is not an object or array.
   *
   * @private
   * @param  {Any} v: the value to test
   * @return {Boolean}
   */
  const isNotObject = v => v === null || typeof v !== 'object';

  /**
   * Determines if the entry parameter is null or undefined.
   *
   * @private
   * @param  {Any} obj: object to test
   * @return {Boolean}
   */
  const isEmpty = obj => obj === null || obj === undefined;

  /**
   * Removes null and undefined values from an Object or Array.
   *
   * @export
   * @param  {Object | Array} obj: the object to where remove the empty values
   * @return {Any}
   */
  return function(obj) {
    if (isNotObject(obj)) return obj;
    if (obj instanceof Array) {
      for (let i = 0; i < obj.length; i += 1) {
        if (isEmpty(obj[i])) obj.splice(i--, 1); // eslint-disable-line
        else removeEmpty(obj[i]);
      }
    } else {
      for (const p in obj) {
        if (isEmpty(obj[p])) delete obj[p];
        else removeEmpty(obj[p]);
      }
    }
    return obj;
  };
})();

removeEmptyObject.js

/**
 * Remove empty objects or arrays.
 *
 * @export
 * @param  {Object | Array} obj: the object to where remove empty objects or arrays.
 * @return {Any}
 */
var removeEmptyObject = (() => {
  const isNotObject = v => v === null || typeof v !== 'object';
  const isEmpty = obj => Object.keys(obj).length === 0;

  return (obj) => {
    if (isNotObject(obj)) return obj;
    if (obj instanceof Array) {
      for (let i = 0; i < obj.length; i += 1) {
        if (isNotObject(obj[i])) continue;
        if (isEmpty(obj[i])) obj.splice(i--, 1); // test again at same index
        else obj[i] = removeEmptyObject(obj[i]);
      }
    } else {
      for (const p in obj) {
        if (isNotObject(obj[p])) continue;
        if (!isEmpty(obj[p])) obj[p] = removeEmptyObject(obj[p]);
        if (isEmpty(obj[p])) delete obj[p]; // ensures obj[p] is not empty
      }
    }
    return obj;
  };
})();

usage.js

// TEST: removeEmpty
var arr = [1, null, null, 4, null, 6];
hc.removeEmpty(arr);
console.log(arr);

arr = [[2, null, 6], [undefined, null, 9], [[null, 3], 7, undefined]];
hc.removeEmpty(arr);
console.log(JSON.stringify(arr));

var obj  = { hola: undefined, id: 1, info: null, name: 'pepe', age: 0 };
hc.removeEmpty(obj);
console.log(obj);

// TEST: removeEmptyObject
var json = '{"test": [{},{},{"x": 1}], "test2": [{},{}], "test3":[[],[1,2,3],[]], "a": 1, "b": 2}';
var data = JSON.parse(json);
removeEmptyObject(data);
console.log(data);