Validate a bank statement descriptor

Normalize a statement descriptor and return a structured validity result under explicit length and character rules.

EasyJavaScript Product Algorithms

30 min0% acceptance

Description

Normalize a statement descriptor and return a structured validity result under explicit length and character rules. Implement the learner-facing contract completely and satisfy every observable requirement without relying on hidden infrastructure.

Requirements

Export validateStatementDescriptor from src/App.js.
Trim outer whitespace, collapse internal whitespace, and uppercase the descriptor.
Reject a descriptor that contains no ASCII letter.
Allow letters, digits, spaces, periods, and hyphens while rejecting other characters.
Require the normalized descriptor length to be between five and input.maxLength inclusive.
Return an observably equivalent result for equivalent inputs without reading time, randomness, network, storage, or DOM globals.
Do not mutate input objects, arrays, nested records, or values retained in the returned result.

Valid descriptor

Input

'  Acme   Shop  ' with maxLength 22

Expected output

ACME SHOP is returned as valid

Explanation

Trim outer whitespace, collapse internal whitespace, and uppercase the descriptor.

Invalid symbols

Input

'SHOP*NOW'

Expected output

The result is invalid with reason invalid-characters

Explanation

Reject a descriptor that contains no ASCII letter.

Constraints

Implement a pure synchronous function with no external side effects
Treat every input collection and nested record as read-only
Return JSON-compatible data except where the declared TypeScript API explicitly uses bigint

Hints

Hint 1

Start with the normalizes-spacing-case behavior and make its observable result deterministic.

Hint 2

Model requires-letter independently before combining it with the remaining states.

Hint 3

Verify the boundary described by enforces-length without changing caller-owned input.

JavaScriptvalidationnormalization