Union of Array of Objects in JavaScript and es6?

by

You could implement your own pretty easily. In this case, we make the function generic, so that it can take arrays of any data type(s) and union them using the comparator function provided.

// arr1 and arr2 are arrays of any length; equalityFunc is a function which
// can compare two items and return true if they're equal and false otherwise
function arrayUnion(arr1, arr2, equalityFunc) {
    var union = arr1.concat(arr2);

    for (var i = 0; i < union.length; i++) {
        for (var j = i+1; j < union.length; j++) {
            if (equalityFunc(union[i], union[j])) {
                union.splice(j, 1);
                j--;
            }
        }
    }

    return union;
}

function areGamesEqual(g1, g2) {
    return g1.title === g2.title;
}

// Function call example
arrayUnion(arr1, arr2, areGamesEqual);

Refer to Object comparison in JavaScript for various object comparison implementations.

More Related Contents:

  1. Javascript object literal: what exactly is {a, b, c}?
  2. Is it possible to import modules from all files in a directory, using a wildcard?
  3. Why does babel rewrite imported function call to (0, fn)(…)?
  4. Call async/await functions in parallel
  5. How to import jquery using ES6 syntax?
  6. When is the body of a Promise executed?
  7. How can I clone a JavaScript object except for one key?
  8. Javascript ES6 TypeError: Class constructor Client cannot be invoked without ‘new’
  9. ES6 modules in the browser: Uncaught SyntaxError: Unexpected token import
  10. Why do I need to await an async function when it is not supposedly returning a Promise?
  11. ES6 Promises – something like async.each?
  12. “Uncaught ReferenceError: this is not defined” in class constructor
  13. What is the meaning of “…args” (three dots) in a function definition?
  14. Is using an ES6 import to load specific names faster than importing a namespace?
  15. Using Array objects as key for ES6 Map
  16. Function parameter definitions in ES6
  17. Simplest way to merge ES6 Maps/Sets?
  18. Clean way to keep original variable and destructure at the same time
  19. arrow function and this
  20. Difference between import X and import * as X in node.js (ES6 / Babel)?
  21. ES6+ javascript module export options
  22. ES6 deep nested object destructuring
  23. Omit property variable when using object destructuring
  24. How to extract data out of a Promise
  25. Array.from() vs spread syntax
  26. ES2015 “import” not working in node v6.0.0 with with –harmony_modules option
  27. Does ECMAScript 6 have a convention for abstract classes? [duplicate]
  28. Array.fill gives same object repeated. why? [duplicate]
  29. How to use ES6 Fat Arrow to .filter() an array of objects
  30. Output an ES module using webpack

Leave a Comment