text: const a = [2,3,4,5];
  
  // gets a's odd elements
  console.log(a.filter(x => x % 2 === 1 ));
  
  // gets a's even elements
  console.log(a.filter(x => x % 2 === 0 ));
  
  // gets a's map and multiply each one them 2*
  console.log(a.map(x => x *= 2));
  console.log(a);
  
  // gets a's all elements and returns their 2*
  a.forEach(x=> console.log(x*2));
  
  // gets a's map and multiply each one them according to conditions
  const result = a.map(x => {
      if (x % 2 ===0){
          return x*5;
      } else{
          return x*3;
      }
  });
  
  console.log(result);