Grouping.indexOf Method
Returns the index where the element equal to value first appears in this sequence, optionally
using an equality comparer to compare the value to elements in the sequence.
Parameters
- value
-
Type: Object
The value to search for in this sequence.
- equalityComparer
-
Type: IEqualityComparer
Optional: True
Return Value
Type: Number (Integer)
The index in this sequence where the value first appears, or -1 if it is not in this sequence.