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findLastKey javascript Code Snippet in 2023

objectintermediate

Last Updated: 28 January 2023

Finds the last key that satisfies the provided testing function. Otherwise undefined is returned.

  • Use Object.keys(obj) to get all the properties of the object.
  • Use Array.prototype.reverse() to reverse the order and Array.prototype.find() to test the provided function for each key-value pair.
  • The callback receives three arguments - the value, the key and the object.
const findLastKey = (obj, fn) => Object.keys(obj) .reverse() .find(key => fn(obj[key], key, obj));
findLastKey( { barney: { age: 36, active: true }, fred: { age: 40, active: false }, pebbles: { age: 1, active: true } }, x => x['active'] ); // 'pebbles'

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