Quick Answer
Fiber implements cooperative scheduling using a linked-list work loop instead of the call stack. Each fiber is one unit of work. React's scheduler checks if there's a higher-priority task or a frame deadline after completing each fiber. If yes, it yields control to the browser, then resumes from where it left off. No call stack explosion, no blocking.
Answer
Fiber creates a linked list tree where each unit of work is a fiber node. Instead of recursively calling functions, React manually iterates the tree, yielding control back to the browser using shouldYield so higher-priority events can run, enabling cooperative multitasking.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
