How to filter an array by property?

• 0
  There is an arr array:
  

  [
    { id: "5jq", url: "https://cdn2.thecatapi.com/images/5jq.jpg", width: 320 },
    { id: "5qj", url: "https://cdn2.thecatapi.com/images/5qj.jpg", width: 480 }
  ]

  
  A similar array newArr comes. How to add objects from the newArr array to the arr array that are not in arr by id?

  JavaScript Marilyn McClure, May 21, 2019

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1 Answers
• 0

  arr.push(...newArr.filter(n => !arr.some(m => m.id === n.id)));

  
  
  or
  
  
  
  

  arr = Object.values([ ...arr, ...newArr ].reduce((acc, n) => (acc[n.id] ||= n, acc), {}));

  Emerson Lloyd

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