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← Introduction to JavaScript
○What is JavaScript?○Your First JavaScript Code○Data Types○Type Checking○Inspect Values in the Console○Inspect the Queue Report○Trace a Faulty Calculation○Repair the Score Calculation✦Module Quiz
○Declaring Variables○let and const in Practice○Operators○Type Conversion○Group and Convert Expense Inputs○Calculate the Event Expense Total○Track a Changing Points Tally○Adjust a Ticket Price✦Module Quiz
○Conditionals○Demo: Combined Conditions Before FizzBuzz○Challenge: FizzBuzz Announcer○Switch Statement○Demo: Switch a Venue Sign○Challenge: Power Loadout○For Loops○While Loop○Break and Continue○Demo: Stop a Ticket Scan○Challenge: Number Guess Referee○Demo: Rainfall Routing Walkthrough○Exercise: Score Batch Report✦Module Quiz
○Defining Functions○Arrow Functions○Scope○Closures○Project - Calculator○Function Expressions○Demo: Ticket Pricing Walkthrough○Exercise: Shipping Labels with Defaults○Demo: Seat Ledger Closure Walkthrough○Exercise: Private Budget Ledger✦Module Quiz
○Arrays○Demo: Student Scoreboard○Challenge: Student Course Scoreboard○Array Mutation Methods○Array Slice and Concat○Array Iteration Methods○Multidimensional Arrays○Destructuring○Array Reverse and Sort○Array Fill○Array Find and Includes○Array Flat and FlatMap○Array Reduce, Some, and Every○Demo: Charging Rack Restock Report○Exercise: Pantry Restock Plan✦Module Quiz
○Object Key-Value Pairs○Student Course Record○Object Methods and Destructuring○Map and Set Collections○Playlist Lookup○Number and BigInt Boundaries○Ticket Ledger○JSON○Math and Date○Date Basics○Demo: Supply Bin Audit●Exercise: Volunteer Shift Audit○Demo: Workshop Attendance Feed○Exercise: Parcel Scan Feed✦Module Quiz
○String Methods○Template Literals○Regular Expressions○Demo: Build a Reminder with Template Literals○Exercise: Format Pantry Pickup Messages○Demo: Validate a Time Slot with Regex○Exercise: Validate Storage Shelf Labels✦Module Quiz
○Higher-Order Functions○Callbacks○map, filter, and reduce○Demo: Student Register with map○Challenge: Student Register○Recursion○Project - Data Transform Pipeline○Demo: Handle an Error-First Callback○Exercise: Report Seat Reservation Results○Demo: Summarize Completed Bike Rides○Exercise: Summarize Delivered Parcels✦Module Quiz
○Demo: A notebook object○OOP Introduction○Demo: Independent workshop passes○Classes○Demo: An inherited notice○Inheritance○Demo: A private seat counter○Encapsulation○Demo: Equipment desk checkout○Project: Library Checkout✦Module Quiz
○Demo: Callback Timing○Exercise: Asynchronous JavaScript○Demo: Promise Rehearsal○Exercise: Promises and Async Await○Demo: Offline API Coordination○Exercise: Async API Simulation○Demo: Partial Results Bulletin○Project: Resilient Awards Feed○Demo: Retry a Local Delivery○Project: Reliable Score Delivery✦Module Quiz

Exercise: Volunteer Shift Audit

The supply-bin demo used a variable as an object key and scanned key-value pairs for low counts. Apply both ideas to volunteer shifts in script.js.

For example, a locker room with const lockers = { north: 0, south: 4 } could read lockers["north"] as zero and use Object.entries(lockers) to find names below two. Use Object.hasOwn(slots, requested) to distinguish a missing key from a present key with a value of zero. Here, you are auditing people assigned to shifts, not lockers.

Worked example

Here is the same lookup-and-scan pattern with supply bins rather than shifts:

javascript
const bins = { paper: 0, ink: 4 };
const requested = "paper";
const low = Object.entries(bins).filter(([, count]) => count < 2);
console.log(bins[requested], low.map(([name]) => name)); // 0 ["paper"]

Your Task

  1. Write readAvailability(slots, requested) using bracket lookup and Object.hasOwn() to return the requested count, or null when the key is missing.
  2. Write lowShiftNames(slots, minimum) using Object.entries() to return the names below the minimum in entry order.
  3. Write auditShifts(slots, requested, minimum) to return { available, needsHelp } using those helpers.
  4. Keep the input object unchanged after calling auditShifts().
  5. Log 2 | checkIn, cleanup from auditShifts(shiftSlots, "checkIn", 3) on its own Console line.
Hint 1
1 / 2
HINT 1

Use slots[requested] to look up a key held in a variable.

HINT 2

Object.entries(slots) gives [name, count] pairs to filter and map.

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