Ravi Sir's Cards › AWS
FREE HELD SOLD
This interview card covers FREE HELD SOLD. Missing state machine leaves seats stuck. FREE, then HELD on hold; HELD, then SOLD on pay; release, then FREE. Draw diagram , then implement both txns , then TTL abandon path.
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What this card says
What it is
Missing state machine leaves seats stuck.
Why it matters
FREE→HELD on hold; HELD→SOLD on pay; release→FREE.
HELD
How / example
Draw diagram → implement both txns → TTL abandon path.
Whiteboard favorite.