.findIndex(array, [predicate=.identity], [fromIndex=0])

sourcenpm package

This method is like _.find except that it returns the index of the first element predicate returns truthy for instead of the element itself.

Since

1.1.0

Arguments

• array (Array): The array to inspect.
• [predicate=.identity] (Function)_: The function invoked per iteration.
• [fromIndex=0] (number): The index to search from.

Returns

(number): Returns the index of the found element, else -1.

Example

var users = [
  { 'user': 'barney',  'active': false },
  { 'user': 'fred',    'active': false },
  { 'user': 'pebbles', 'active': true }
];
 
_.findIndex(users, function(o) { return o.user == 'barney'; });
// => 0
 
// The `_.matches` iteratee shorthand.
_.findIndex(users, { 'user': 'fred', 'active': false });
// => 1
 
// The `_.matchesProperty` iteratee shorthand.
_.findIndex(users, ['active', false]);
// => 0
 
// The `_.property` iteratee shorthand.
_.findIndex(users, 'active');
// => 2