Advanced language assessment

Opening your lesson

Use this assessment to practice a timed language screen after finishing the advanced units. It mixes typing decisions with runtime behavior, so an answer that compiles but changes the requested result won't pass. The tasks use the same local code workspace and supplied examples as the rest of the course.

Read each contract before editing. Allocate time for the hidden boundary cases rather than spending every minute on the first implementation. You will select a typed field, construct a public record, complete settings, extract an element type, propagate a promise rejection, distinguish missing and empty text, validate a form, and schedule retrying jobs. This is an original job-test-style assessment. There is no official JavaScript or TypeScript certification format attached to it.

function field<T, K extends keyof T>(record: T, key: K): T[K] { return record[key]; }
function solve(value: string): string { const row = JSON.parse(value) as {code:string;region:string;key:"code"|"region"}; return field(row,row.key); }

A complete implementation for the first scenario; trace its input before editing.

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