_.findIndex

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

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

  1. array (Array): The array to inspect.
  2. [predicate=_.identity] (Function): The function invoked per iteration.
  3. [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
doc_Lodash
2016-11-27 16:36:51
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