How should I practice Template Variable Expansion?

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

Is Template Variable Expansion associated with Google?

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

Template Variable Expansion

Google● MediumFULLTIMEONSITE INTERVIEW

Problem statement

You are given key-value mappings and a source string. Any substring inside a pair of percent signs, such as %key%, should be treated as a key and replaced by its mapped value.

A mapped value may itself contain another key placeholder, so replacements may need to be resolved recursively.

The problem statement continues

Pro

Examples

Example 1

mappings = [["x","%y%/home"],["y","user"]]source = "/%x%/docs"return = "/user/home/docs"

%x% expands to %y%/home, and %y% expands to user.

The source shared the rule but did not include this exact sample. FastPrep added this small example so the behavior can be checked directly.

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