objects.findKey

[jkvyff]

FindKey will return the key value of the first object value it encounters that matches or returns true for the predicate

Checklist

• implementation
• tests
• jsdoc

Details

A slight amalgam of version 3 and 4 of Lodash's implementation, with allowing for both array selection notation as well as a 'this' argument.

const users = {
  'barney':  { 'age': 36, 'active': true },
  'fred':    { 'age': 40, 'active': false },
  'pebbles': { 'age': 1,  'active': true }
};
 
Objects.findKey(users, function(chr) {
  return chr.age < 40;
});
// => 'barney' (iteration order is not guaranteed)
 
Objects.findKey(users, { 'age': 1, 'active': true });
// => 'pebbles'
 
Objects.findKey(users, ['active', false]);
// => 'fred'
 
Objects.findKey(users, 'active');
// => 'barney'

References

• _.findKey - Lodash

[evanplaice]

Added in v0.52