Function findIndex

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

5.2.0

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
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