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omitBy javascript Code Snippet in 2024

objectintermediate

Last Updated: 6 April 2024

Omits the key-value pairs corresponding to the keys of the object for which the given function returns falsy.

  • Use Object.keys() and Array.prototype.filter() to remove the keys for which fn returns a truthy value.
  • Use Array.prototype.reduce() to convert the filtered keys back to an object with the corresponding key-value pairs.
  • The callback function is invoked with two arguments: (value, key).
const omitBy = (obj, fn) => Object.keys(obj) .filter(k => !fn(obj[k], k)) .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});
omitBy({ a: 1, b: '2', c: 3 }, x => typeof x === 'number'); // { b: '2' }

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