Sort the array by the elements in a separate array

Here is a filters array with three values: serviceCode1, serviceCode2, and serviceCode3.

['serviceCode1', 'serviceCode2', 'serviceCode3']

I have another array with approximately 78 records that I want to filter based on the above filters.

  this.mainDataSet = this.mainDataSet.filter((data) => {
    return this.filters.forEach(x => data.serviceCode.includes(x.code!))
   });

However, no matter what, the response is always 0. Even if the mainDataSet contains values from the filters array, nothing seems to be working. Can anyone provide some insight into where I might be going wrong?

javascriptangulartypescript

Answer №1

The forEach function does not return a value, it works directly on the array without returning anything, which means you are only modifying the filters array and not affecting the dataset because no values are being returned from your inner function.

One way to simplify this would be to use the includes method to compare the dataset with the list of filters. It's a much cleaner solution.

const filters = [
  'serviceCode1', 
  'serviceCode2', 
  'serviceCode3'
]

const filteredData =
  mainDataSet.filter((data) => filters.includes(data.serviceCode));

Answer №2

Array.forEach() provides a way to loop through elements without returning any value.

If you need to filter elements in an array based on another array, consider using Array.find().

this.mainDataSet = this.mainDataSet.filter((data) => 
  this.filters.find(x => data.serviceCode.includes(x)));

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