UiPath Data Manipulation and Variables Flashcards

In UiPath, which collection type stores key-value pairs and allows fast lookup by key?

Answer: Dictionary

Dictionary(Of TKey, TValue) stores unique key-value pairs and provides O(1) average lookup time by key.

What VB.NET expression checks if a string variable 'str' is null or empty in UiPath?

Answer: String.IsNullOrEmpty(str)

String.IsNullOrEmpty(str) returns True if str is Nothing or an empty string, making it the safest null-safe check.

Which UiPath activity filters rows in a DataTable based on a condition?

Answer: Filter Data Table

The 'Filter Data Table' activity applies column-based filter conditions and outputs a new DataTable containing only the matching rows.

How do you concatenate two strings 'Hello' and 'World' with a space in UiPath VB.NET?

Answer: B and C are both correct

Both the & operator and String.Concat method are valid VB.NET string concatenation techniques supported in UiPath expressions.

Which UiPath activity removes duplicate rows from a DataTable?

Answer: LINQ on DataTable

UiPath does not have a built-in 'Remove Duplicates' activity; you must use LINQ expressions like dt.AsEnumerable().Distinct() with a custom IEqualityComparer or group by logic.

What is the correct VB.NET expression to get the current date as a formatted string like '2026-03-22' in UiPath?

Answer: DateTime.Now.ToString('yyyy-MM-dd')

DateTime.Now.ToString('yyyy-MM-dd') formats the current date and time using the ISO 8601 date format string.