Build a Festival Crowd Flow Simulator - Step 5

Curriculum Help
1

Tell us what’s happening:

I cannot figure out what is wrong with my code. I am being told “You should assign the element at gate.queue[tickIndex] to a variable named currentTickQueue” even though everything works! I have been trying to figure this out all day. Thank you.


### Your code so far


```js
const morningGates = [
  { id: "North", capacity: 5, queue: [3, 6, 2, 4] },
  { id: "East", capacity: 3, queue: [2, 4, 3, 5] },
  { id: "South", capacity: 4, queue: [1, 2, 3, 1] },
  { id: "West", capacity: 2, queue: [4, 1, 2, 3] },
];

const nightGates = [
  { id: "North", capacity: 4, queue: [6, 2, 5, 1] },
  { id: "East", capacity: 2, queue: [3, 3, 4, 2] },
  { id: "South", capacity: 5, queue: [2, 1, 2, 3] },
  { id: "West", capacity: 3, queue: [5, 2, 1, 4] },
];

function initializeThroughput(gates) {
  const summary = {};
  for (const gate of gates) {
    summary[gate.id] = 0;
  };
  return summary;
}

function processGateFlow(gate, tickIndex) {
// User Editable Region
  let currentTickQueue = gate.queue[tickIndex];
// User Editable Region
  let processed = 0;
  while (currentTickQueue > 0 && processed < gate.capacity) {
    currentTickQueue--;
    processed++;
  }
  return { processed: processed, overflow: currentTickQueue };
}


function rerouteOverflow(gates, currentGate, tickIndex, overflowAmount) {
  const currentIndex = gates.indexOf(currentGate);
  const nextGateIndex = (currentIndex + 1) % gates.length;
  gates[nextGateIndex].queue[tickIndex] += overflowAmount;
  console.log(
    overflowAmount + " attendees rerouted to " +
    gates[nextGateIndex].id
  );
}

function handleGateAtTick(gates, gate, tickIndex, throughputSummary) {
  console.log("\nProcessing " + gate.id + "...");
  console.log(
    gate.queue[tickIndex] + " attendees arriving."
  );
  const result = processGateFlow(gate, tickIndex);
  throughputSummary[gate.id] += result.processed;
  if (result.overflow > 0) {
    console.log(
      "Overflow of " + result.overflow +
      " attendees. Rerouting..."
    );
    rerouteOverflow(gates, gate, tickIndex, result.overflow);
  }
}

function printSummary(summary) {
  console.log("\nThroughput Summary");
  for (const gateId in summary) {
    console.log(
      gateId + ": " + summary[gateId] +
      " attendees processed"
    );
  }
}

function simulateFestival(gates, timeBlock) {
  console.log("\n" + timeBlock + " Simulation");
  const throughputSummary = initializeThroughput(gates);
  const maxTicks = gates[0].queue.length;
  let tickIndex = 0;
  while (tickIndex < maxTicks) {
    console.log("\nTick " + (tickIndex + 1));
    for (const gate of gates) {
      handleGateAtTick(gates, gate, tickIndex, throughputSummary);
    }
    tickIndex++;
  }
  printSummary(throughputSummary);
}

simulateFestival(morningGates, "Morning");

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Challenge Information:

Build a Festival Crowd Flow Simulator - Step 5

GitHub Link: freeCodeCamp/curriculum/challenges/english/blocks/workshop-festival-crowd-flow-simulator/69babea99725b43a01adb6d1.md at main · freeCodeCamp/freeCodeCamp · GitHub

2

Hi @admagee63,

You have posted a lot more code than what was provided as starting code for Step 5.

I suggest resetting this step and trying again, being careful to only do what is asked in this step.

Happy coding

3

Here is the exact code:


const morningGates = [
  { id: "North", capacity: 5, queue: [3, 6, 2, 4] },
  { id: "East", capacity: 3, queue: [2, 4, 3, 5] },
  { id: "South", capacity: 4, queue: [1, 2, 3, 1] },
  { id: "West", capacity: 2, queue: [4, 1, 2, 3] },
];

const nightGates = [
  { id: "North", capacity: 4, queue: [6, 2, 5, 1] },
  { id: "East", capacity: 2, queue: [3, 3, 4, 2] },
  { id: "South", capacity: 5, queue: [2, 1, 2, 3] },
  { id: "West", capacity: 3, queue: [5, 2, 1, 4] },
];

function initializeThroughput(gates) {
  const summary = {};
  for (const gate of gates) {
    summary[gate.id] = 0;
  };
  return summary;
}

function processGateFlow(gate, tickIndex) {
  let currentTickQueue = gate.queue[tickIndex];
  let processed = 0;
  while (currentTickQueue > 0 && processed < gate.capacity){
    currentTickQueue--;
    processed++;
  }
  return{processed:processed, overflow:currentTickQueue};
}
4

Access the value in the input gate’s queue array at index tickIndex, and assign it to a variable named currentTickQueue.

This is all you need to do. It should be 1 new line of code.

5

I reset and did just the one line and now it passed. Thank you @dhess! I made it more complicated than it should have been.