Exercises 20‐9

Implement the following JavaScript functions:

1. filterProperties(propNames,obj)

   Receives a string array in propNames and an object in obj. Returns a new object with the properties from obj whose names are present in propNames. If propNames contains names that do not exist in obj, those properties are not added to the returned object.

   Example:

   const o = {a: 1, b: 'Thor', c: [1,2,3], d: {x: 10}, e: 2, f: 'Captain America'}
   
   const props = ['b', 'd', 'g', 'a']
   const oFiltered = filterProperties(props, o)
   // oFiltered: {a: 1, b: 'Thor', d: {x: 10}}

2. filterPropertiesN(propNames,objs)

   Receives a string array in propNames and an object array in objs. Returns a new object array with objects produced by applying the filterProperties function with propNames to each object in objs.

   NOTE: In this implementation, the usage of any cycle instruction (for/while) or the Array.forEach method reduces the grade in 50%.

   const objs = [
      {a: 1, b: 'Thor', c: [1,2,3], d: {x: 10}, e: 2, f: 'Captain America'},
      {b: 'Hulk', a: [1,2,3], d: {x: 10}, e: 2, g: false}, 
      {x: 'Vision', y: false}
   ]
   
   const props = ['b', 'd', 'g', 'a']
   const objsFiltered = filterPropertiesN(props, objs)
   /*
    objsFiltered: [
      {a: 1, b: 'Thor', d: {x: 10}},
      {b: 'Hulk', a: [1,2,3], d: {x: 10}, g: false}, 
      { }
   */