Transpose Wide to Long in R | Dataford Interview Questions

Write a code snippet in R to transpose a wide dataset into a long format.

Implement the equivalent transformation for a list of records represented as dictionaries. Preserve identifier values, emit one record per selected value column, and process input rows and value columns in their original order. Return the transformed records with keys for the identifiers, the original column name, and its value.

Constraints

0 <= len(rows) <= 1000
Each row contains every name listed in id_columns and value_columns
id_columns and value_columns contain unique column names
The output order is input row order followed by value_columns order

Function Signature

def wide_to_long(rows, id_columns, value_columns):

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Problem

Write a code snippet in R to transpose a wide dataset into a long format.

Constraints

0 <= len(rows) <= 1000
Each row contains every name listed in id_columns and value_columns
id_columns and value_columns contain unique column names
The output order is input row order followed by value_columns order

Function Signature

def wide_to_long(rows, id_columns, value_columns):

Your question is Transpose Wide to Long in R. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.