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Code-Alongs

Code-Along 1: Introduction to CodeSignal

Introduction to CodeSignal and its user interface. This code-along walks you through the CodeSignal platform, how to navigate the interface, and how to approach coding challenges effectively.

Learning Objectives

  • Create and set up a CodeSignal account
  • Navigate the CodeSignal user interface
  • Understand how to review a task in CodeSignal
  • Learn how to debug and submit solutions
  • Apply basic coding knowledge to solve introductory problems

During this session, we'll explore the CodeSignal platform and solve a sample problem together. You'll learn how to:

We'll implement a simple function that demonstrates key programming concepts:

// Sample function that checks if a number is even
function isEven(num) {
    // Return true if num is divisible by 2 (even)
    // Return false otherwise (odd)
    return num % 2 === 0;
}

// Testing our function
console.log(isEven(4));  // true
console.log(isEven(7));  // false

Resources

Code-Along 2: Advanced Challenges

This code-along focuses on advanced coding challenges, with an emphasis on array manipulation, string operations, and algorithmic problem-solving. We'll work through several medium-difficulty problems to strengthen your technical interview skills.

Learning Objectives

  • Apply array operations to solve complex problems
  • Implement string manipulation techniques
  • Utilize boolean logic and conditional statements
  • Construct efficient solutions using loops
  • Analyze time and space complexity
  • Identify and apply appropriate data structures

During this session, we'll tackle more advanced problems that require:

We'll implement a solution that demonstrates array filtering:

// Function to filter out all negative numbers from an array
function filterPositiveNumbers(numbers) {
    // Create empty result array
    let positiveNumbers = [];
    
    // Loop through input array
    for (let i = 0; i < numbers.length; i++) {
        // Add only positive numbers to result array
        if (numbers[i] > 0) {
            positiveNumbers.push(numbers[i]);
        }
    }
    
    return positiveNumbers;
}

// Testing our function
const mixedNumbers = [-3, 1, -7, 4, 5, -2, 8];
console.log(filterPositiveNumbers(mixedNumbers));  // [1, 4, 5, 8]

Resources