How should I practice Nested Template Variable Expansion?

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

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Nested Template Variable Expansion

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Problem statement

Render a text template using named variables. Each row of variables is [name, value].

The template and variable values may contain two placeholder forms:

{name} inserts the fully expanded value of that variable.
{name|singular|plural} requires the fully expanded value of name to be a non-negative integer. It inserts the number, one space, and singular when the number is 1; otherwise it inserts the number, one space, and plural.

Variable values may reference other variables. Expand them recursively, then render the input template.

Function

renderTemplate(text: String, variables: String[][]) → String

Examples

Example 1

text = "I like {animal}."variables = [["animal","dogs"]]return = "I like dogs."

The simple placeholder is replaced by the value of animal.

Example 2

text = "Adopt {count|dog|dogs}."variables = [["count","1"]]return = "Adopt 1 dog."

The numeric value is exactly 1, so the singular form is selected.

Example 3

text = "{greeting} You have {count|message|messages}."variables = [["name","Mina"],["greeting","Hello, {name}!"],["rawCount","2"],["count","{rawCount}"]]return = "Hello, Mina! You have 2 messages."

Both greeting and count expand through another variable before the outer template is rendered.

Constraints

1 <= template.length <= 200000.
1 <= variables.length <= 100000.
Variable names are unique and contain only ASCII letters, digits, and underscores.
Every referenced variable exists, references are acyclic, and nesting depth is at most 1000.
Singular and plural labels are non-empty and contain no braces or |.
The rendered output length is at most 10^6.