4.17.11
3.10.1
2.4.2
1.3.1

_.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

argument
array
[predicate=_.identity]
[fromIndex=0]
type
Array
Function
number
description
The array to inspect.
The function invoked per iteration.
The index to search from.

Returns

(array)

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

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