The array to inspect.
Optionalpredicate: anyThe function invoked per iteration.
OptionalfromIndex: numberThe index to search from.
Returns the index of the found element, else -1.
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
This method is like
findexcept that it returns the index of the first elementpredicatereturns truthy for instead of the element itself.