How should I practice Simple Text Editor?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Prophecy onsite interview problems in FastPrep.

Is Simple Text Editor associated with Prophecy?

FastPrep tags this as a Prophecy onsite interview coding practice problem when the problem catalog has that company and stage context.

Problem · Stack

Simple Text Editor

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● EasyPRProphecyFULLTIMEONSITE INTERVIEW

Problem statement

Design a simple text editor that processes a list of commands and outputs the final text.

Supported commands:

type x → Append character x
undo → Remove the last typed character
redo → Reapply the last undone character

Note: Typing a new character after an undo clears the redo history.

Function

finalText(commands: String[]) → String

Examples

Example 1

commands = ["type a", "type b", "undo", "redo", "type c"]return = "abc"

Example 2

commands = ["type a", "type b", "type c", "undo", "undo", "type d"]return = "ad"