Instruction: Explain how Node.js can create and manage child processes, and why this capability is useful.
Context: This question assesses the candidate's understanding of the child_process module in Node.js and its applications in executing external processes or scripts from a Node.js application.
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To begin with, Node.js can create child processes using functions provided by the child_process module, such as exec, spawn, fork, and execFile. Each of these functions serves different use cases and offers various levels of control over the child processes. For example, spawn is used for streaming large volumes of data because it works with streams, while exec is more suited for small, synchronous tasks as it buffers data in memory.
One of my significant strengths lies in architecting and optimizing Node.js applications for performance and scalability. Throughout my career at leading tech companies, I've leveraged the child_process module to enhance application capabilities and perform resource-intensive tasks without blocking the main event loop....