Filter a object based on another Array

December 3, 2024

I am trying to filter a object based on an another array.

data = {
  'TypeA': ['A1', 'A2', 'A3', 'A4'],
  'TypeB': ['B1', 'B2', 'B3', 'B4'],
  'TypeC': ['C1', 'C2', 'C3', 'C4'],
}

array = ['TypeA', 'TypeB']

I want to get a new array with the values of both ‘TypeA’ and ‘TypeB’ like [‘A1’, ‘A2’, ‘A3’, ‘A4’, ‘B1’, ‘B2’, ‘B3’, ‘B4’] and remove duplicates if any also.

so far i have tried,

tTmp_Arr = data.filter(tObj => array.includes(tObj))

Any help is much appreciated.

Thanks in advance.

Thanks,

>Solution :

You can’t use filter on objects. You can get the result by flatmapping and then filtering as:

const data = {
  'TypeA': ['A1', 'A2', 'A3', 'A4'],
  'TypeB': ['B1', 'B2', 'B3', 'B4'],
  'TypeC': ['C1', 'C2', 'C3', 'C4'],
};

const array = ['TypeA', 'TypeB'];

const result = array
  .flatMap(key => data[key] || []) 
  .filter((item, index, self) => self.indexOf(item) === index);
  
console.log(result);