Day 4: GitHub Copilot Training – Loops, Arrays, and Objects

🟦 Day 4: Copilot with Loops, Arrays, and Objects

🎯 Goal:

Use Copilot to help write code involving:

• Loops (for, while, etc.)
• Arrays/lists
• Objects/dictionaries

This helps in data processing, CRUD operations, and logic building.

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🔧 Step 1: Loop Structures

Open a .py, .js, or .java file and try these prompts:

🐍 Python:

# Print numbers from 1 to 10

Copilot suggests:

for i in range(1, 11):
    print(i)

💻 JavaScript:

// Print even numbers from 1 to 20

Copilot suggests:

for (let i = 1; i <= 20; i++) {
  if (i % 2 === 0) console.log(i);
}

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🔧 Step 2: Array/List Operations

🐍 Python:

# Filter even numbers from a list

# Find the sum of all numbers in a list

💻 JavaScript:

// Find the largest number in an array
// Reverse an array
// Count occurrences of each element in an array

Copilot will usually suggest map, filter, reduce, or loops automatically.

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🔧 Step 3: Objects / Dictionaries

🐍 Python:

# Count word frequency in a sentence using dictionary

Copilot likely gives:

def word_frequency(sentence):
    words = sentence.split()
    freq = {}
    for word in words:
        freq[word] = freq.get(word, 0) + 1
    return freq

💻 JavaScript:

// Create a student object with name, age, and marks
// Update the marks property

let student = {
  name: "Ravi",
  age: 18,
  marks: 85
};
student.marks = 90;

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🧪 Practice Challenges

Try one of these prompts and let Copilot complete the logic:

1. # Find all unique elements in a list
2. // Count how many times each letter appears in a string
3. # Remove duplicates from a list
4. // Convert an array of objects to a single object grouped by category
5. # Sort a list of dictionaries by key 'age'

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📚 Bonus: Combine Concepts

Prompt Copilot like this:

# Given a list of student dictionaries, return the names of those who scored above 80

Copilot might give you:

def top_students(students):
    return [s['name'] for s in students if s['marks'] > 80]

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✅ Summary of Day 4

Focus Area	Example Prompt
Loops	# Print numbers from 1 to 10
Arrays/Lists	# Find sum of elements in a list
Objects/Dictionaries	# Group names by department in a dictionary

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