Why does forEach function just return object array property one time?

Question

So, i have an object array

const paddocks = [
  { paddockManagerId: 6, farmId: 1, paddockTypeId: 1, harvestYear: 2019, area: 1200 },
  { paddockManagerId: 1, farmId: 3, paddockTypeId: 4, harvestYear: 2019, area: 500 },
  { paddockManagerId: 5, farmId: 3, paddockTypeId: 2, harvestYear: 2020, area: 20000 },
  { paddockManagerId: 2, farmId: 2, paddockTypeId: 3, harvestYear: 2021, area: 8401},
  { paddockManagerId: 3, farmId: 1, paddockTypeId: 1, harvestYear: 2020, area: 2877 },
  { paddockManagerId: 5, farmId: 2, paddockTypeId: 2, harvestYear: 2017, area: 15902 },
  { paddockManagerId: 3, farmId: 3, paddockTypeId: 2, harvestYear: 2018, area: 1736 },
  { paddockManagerId: 2, farmId: 3, paddockTypeId: 3, harvestYear: 2020, area: 2965 },
  { paddockManagerId: 4, farmId: 3, paddockTypeId: 4, harvestYear: 2018, area: 1651 },
  { paddockManagerId: 5, farmId: 1, paddockTypeId: 1, harvestYear: 2018, area: 700 },
  { paddockManagerId: 1, farmId: 2, paddockTypeId: 1, harvestYear: 2019, area: 7956 },
  { paddockManagerId: 5, farmId: 3, paddockTypeId: 2, harvestYear: 2020, area: 3745 },
  { paddockManagerId: 6, farmId: 1, paddockTypeId: 3, harvestYear: 2021, area: 11362 },
  { paddockManagerId: 2, farmId: 3, paddockTypeId: 3, harvestYear: 2021, area: 300 },
  { paddockManagerId: 3, farmId: 2, paddockTypeId: 2, harvestYear: 2020, area: 19188 },
  { paddockManagerId: 3, farmId: 1, paddockTypeId: 1, harvestYear: 2019, area: 17137 },
  { paddockManagerId: 4, farmId: 3, paddockTypeId: 2, harvestYear: 2020, area: 100 },
  { paddockManagerId: 2, farmId: 1, paddockTypeId: 3, harvestYear: 2019, area: 11845 },
  { paddockManagerId: 5, farmId: 2, paddockTypeId: 1, harvestYear: 2018, area: 15969 },
  { paddockManagerId: 1, farmId: 3, paddockTypeId: 1, harvestYear: 2029, area: 10420 },
  { paddockManagerId: 5, farmId: 2, paddockTypeId: 3, harvestYear: 2010, area: 3200 },
  { paddockManagerId: 6, farmId: 1, paddockTypeId: 2, harvestYear: 2012, area: 10587 },
  { paddockManagerId: 2, farmId: 2, paddockTypeId: 2, harvestYear: 2018, area: 16750 }
];

and then i have an empty object that will store each paddockTypeId using a forEach function.

const areaPaddocks={}

paddocks.forEach(paddock=>{
  const {area, paddockTypeId}=paddock;
  //return paddock.id;
  areaPaddocks[paddockTypeId]=0 //Initialize sum to 0
})

So, my question is, why does forEach function returns this:

{ '1': 0, '2': 0, '3': 0, '4': 0 }

and not this:

{ '1': 0, '4': 0, '2': 0, '3': 0, '1': 0, '2': 0 ...etc}