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findKey javascript Code Snippet in 2024

objectintermediate

Last Updated: 16 June 2024

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

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

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