## Problem Implement a minimal string template engine. Templates may contain: - Variable substitution: `{{variable_name}}` - Conditionals: `{{#if condition}}...{{/if}}` - Loops: `{{#each items}}...{{item}}...{{/each}}` ```python def render_template(template: str, context: dict) -> str: ... ``` ``` Template: "Hello {{name}}! {{#if premium}}You have pro access.{{/if}}" "Items: {{#each cart}}{{item.name}} (${{item.price}}) {{/each}}" Context: {"name": "Alice", "premium": True, "cart": [{"name": "Book", "price": 10}]} Output: "Hello Alice! You have pro access." "Items: Book ($10) " ``` ## Follow-ups 1. How do you handle nested `{{#if}}` inside `{{#each}}`? Describe your parsing approach (recursive descent vs regex). 2. What happens if `context` is missing a key referenced in the template? Silent empty string or error? 3. Sanitize output against XSS: if `name = " alert(1) "`, what should your renderer do? 4. Your engine currently runs in O(n) per render. If the same template is rendered 10,000 times, how do you precompile it for speed?

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String Template Parser: Parse and Render Templates with Variable Substitution and Conditionals

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Problem Implement a minimal string template engine. Templates may contain: Variable substitution: {{variable_name}} Conditionals: {{#if condition}}...{{/if}} Loops: {{#each items}}...{{item}}...{{/each}} Follow-ups How do you handle nested {{#if}} inside {{#each}}? Describe your parsing approach (recursive descent vs regex). What happens if context is missing a key referenced in the template? Silent empty string or error? Sanitize output against XSS: if name = "<script>alert(1)</script>", what s…

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This is a candidate experience report from a figma interview during the phone round.

It covers the following topics: Strings, Phone, Recursion, Coding, Onsite .

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Strings Phone Recursion Coding Onsite

String Template Parser: Parse and Render Templates with Variable Substitution and Conditionals

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