Date_Range.index_of

index_ofconditionstart

Group: Values

Documentation

Returns the index of an element in the range. Returns Nothing if the element is not found.

Arguments

• condition: Either the element to search for, a Filter_Condition or a predicate function to test each element.
• start: The index to start searching from. If the index is negative, it is counted from the end of the range.

Examples

Find the index of a first day that is a Monday.

      (Date.new 2020 10 01).up_to (Date.new 2020 10 31) . index_of (d-> d.day_of_week == Day_Of_Week.Monday)