String to Integer Conversion with Ruby for Coding Interviews

Mastering low-level string manipulation is a classic milestone for software engineers, frequently tested in technical interviews. This text-based course guides you through the mechanics of parsing strings and converting them into 32-bit signed integers without relying on built-in casting methods. You will start by understanding the foundational logic behind character encoding and positional notation before writing a single line of code. Through clear, written explanations and structured text exercises, you will learn to handle real-world parsing challenges systematically. What you'll learn: Understand the mathematical foundations of base-10 number systems and ASCII values; Parse whitespace, optional signs, and non-digit characters safely; Implement the classic atoi algorithm from scratch using Ruby; Manage integer overflow and underflow boundaries for 32-bit environments; Write clean, robust Ruby code using modern type hints and coding conventions; Practice step-by-step dry runs to debug complex edge cases. We begin with core definitions and the anatomy of a valid numerical string, then progress to building a robust, step-by-step parsing algorithm, and conclude with optimization strategies for coding interviews. This course is designed for beginner to intermediate Ruby developers looking to sharpen their algorithmic thinking and prepare for technical screening questions. No advanced computer science background is required to begin. Start reading today to master this fundamental programming challenge.