Question 188193 in Javascript Question posted in
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Javascript – Filter array based on values from another array

I have the following filters array which contains the following three values:

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

I have an another array which contains roughly 78 records, I’m trying to filter this based on the filters listed above.

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

Yet the response is always 0, even when the mainDataSet includes values listed inside the filters array, can someone shed some light in what I’m doing wrong here?

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2

Answers


  1. 0

    Array.forEach() is used to iterate elements, but it won’t return any value.

    You should work with Array.find() in order to filter element in the array based on another array.

    this.mainDataSet = this.mainDataSet.filter((data) => 
  this.filters.find(x => data.serviceCode.includes(x)));
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  2. 0

    forEach does not return a value, it operates on the array in place, so you are just doing work on the filters array not on the dataset since nothing is returning from your inner function.

    I would use the includes method to match the dataset to the filters list. It’s much more readable.

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

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