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11 changes: 1 addition & 10 deletions dead-code/exercise-1.js
Original file line number Diff line number Diff line change
@@ -1,17 +1,8 @@
// Find the instances of unreachable and redundant code - remove them!
// The sayHello function should continue to work for any reasonable input it's given.

let testName = "Jerry";
const greeting = "hello";

function sayHello(greeting, name) {
const greetingStr = greeting + ", " + name + "!";
return `${greeting}, ${name}!`;
console.log(greetingStr);
}

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Run node dead-code/exercise-1.js on main and on your branch. What does each print? Dead code is code that never affects the output, so was console.log(greetingMessage) dead?

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I made the sayHello function to continue to work for any reasonable input it's given.

I added a console.log() now


testName = "Aman";

const greetingMessage = sayHello(greeting, testName);

console.log(greetingMessage); // 'hello, Aman!'
console.log(sayHello("Hi", "Aman"));
30 changes: 13 additions & 17 deletions dead-code/exercise-2.js
Original file line number Diff line number Diff line change
Expand Up @@ -2,27 +2,23 @@
// The countAndCapitalisePets function should continue to work for any reasonable input it's given, and you shouldn't modify the pets variable.

const pets = ["parrot", "hamster", "horse", "dog", "hamster", "cat", "hamster"];

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Where is pets used now?

@russom-g russom-g Oct 22, 2026 •

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I misunderstood the instruction. It is fixed now.

const capitalisedPets = pets.map((pet) => pet.toUpperCase());
const petsStartingWithH = pets.filter((pet) => pet[0] === "h");

function logPets(petsArr) {
petsArr.forEach((pet) => console.log(pet));
}

function countAndCapitalisePets(petsArr) {
const petCount = {};

petsArr.forEach((pet) => {
const capitalisedPet = pet.toUpperCase();
if (petCount[capitalisedPet]) {
petCount[capitalisedPet] += 1;
} else {
petCount[capitalisedPet] = 1;
}
});
petsArr
.filter((pet) => pet[0] === "h")

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The comment on line 2 says this function should keep working for any reasonable input. What does countAndCapitalisePets(["dog", "cat", "dog"]) return on main, and what does it return now?

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Updated.

.forEach((pet) => {
const capitalisedPet = pet.toUpperCase();

if (petCount[capitalisedPet]) {
petCount[capitalisedPet] += 1;
} else {
petCount[capitalisedPet] = 1;
}
});

return petCount;
}

const countedPetsStartingWithH = countAndCapitalisePets(petsStartingWithH);

console.log(countedPetsStartingWithH); // { 'HAMSTER': 3, 'HORSE': 1 } <- Final console log
console.log(countAndCapitalisePets(pets));
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