indexOf source npm
_.indexOf(array, value, [fromIndex=0])
Gets the index at which the first occurrence of value
is found in array
using SameValueZero
for equality comparisons. If fromIndex
is negative, it's used as the offset
from the end of array
. If array
is sorted providing true
for fromIndex
performs a faster binary search.
Arguments
- array (Array)
The array to search.
- value (*)
The value to search for.
- [fromIndex=0] (number)
The index to search from.
Returns (number)
Returns the index of the matched value, else -1
.
Example
_.indexOf([1, 2, 1, 2], 2);
// => 1
// using `fromIndex`
_.indexOf([1, 2, 1, 2], 2, 2);
// => 3