Object.keys()
to get the keys of both objects, create a Set
from them and use the spread operator (...
) to create an array of all the unique keys.Array.prototype.reduce()
to add each unique key to the object, using fn
to combine the values of the two given objects.const deepMerge = (a, b, fn) => [...new Set([...Object.keys(a), ...Object.keys(b)])].reduce( (acc, key) => ({ ...acc, [key]: fn(key, a[key], b[key]) }), {} );
deepMerge( { a: true, b: { c: [1, 2, 3] } }, { a: false, b: { d: [1, 2, 3] } }, (key, a, b) => (key === 'a' ? a && b : Object.assign({}, a, b)) ); // { a: false, b: { c: [ 1, 2, 3 ], d: [ 1, 2, 3 ] } }
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