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combine javascript Code Snippet in 2023

arrayobjectintermediate

Last Updated: 1 February 2023

Combines two arrays of objects, using the specified key to match objects.

  • Use Array.prototype.reduce() with an object accumulator to combine all objects in both arrays based on the given prop.
  • Use Object.values() to convert the resulting object to an array and return it.
const combine = (a, b, prop) => Object.values( [...a, ...b].reduce((acc, v) => { if (v[prop]) acc[v[prop]] = acc[v[prop]] ? { ...acc[v[prop]], ...v } : { ...v }; return acc; }, {}) );
const x = [ { id: 1, name: 'John' }, { id: 2, name: 'Maria' } ]; const y = [ { id: 1, age: 28 }, { id: 3, age: 26 }, { age: 3} ]; combine(x, y, 'id'); // [ // { id: 1, name: 'John', age: 28 }, // { id: 2, name: 'Maria' }, // { id: 3, age: 26 } // ]

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