Filter Array - if the array exists in the array of objects

Question

How Do I filter an array by checking if an array is listed in the array?

cryptoData: Array(100) 0: {CoinInfo: {…}, RAW: {…}, DISPLAY: {…}}

I am trying to check if cryptoData (Array) contains the DISPLAY array and if it does not contain DISPLAY - remove it from the cryptoData array and set the filterArray with only the elements that contain the DISPLAY Array.

My attempt:

var filterdArray = cryptoData.filter(function (el) {
  return cryptoData[el] === 'DISPLAY';
});

this.setState({
  cryptos: filterdArray,
  refreshing: false,
});

el is the element, not the array index. Why do you have cryptoData[el]? — Barmar
– Barmar, Commented Nov 16, 2021 at 17:08

Chandan · Accepted Answer · 2021-11-16 17:25:05Z

2

As the value is an object you can use hasOwnProperty to check if the object has a property.

var filterdArray = cryptoData.filter(function (el) {
  return el.hasOwnProperty('DISPLAY');
});

this.setState({
  cryptos: filterdArray,
  refreshing: false,
});

edited Nov 16, 2021 at 17:25

answered Nov 16, 2021 at 17:07

Chandan

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2 Comments

Frank Boccia Over a year ago

what is the difference between the first parameter and second in the filter callback function?

Chandan Over a year ago

the first one is the element and the second one is the index at which the element is located.

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