_.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
-
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
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