Purpose of the guard statement
WHAT IT TESTS: early-exit control flow. OUTLINE: guard requires its condition to hold or else exits the scope, and unwrapped optionals stay in scope afterward; this flattens nesting versus if.
WHAT IT TESTS: idiomatic Swift control flow and optional unwrapping. ANSWER OUTLINE: guard checks a condition and, if it fails, runs an else block that must leave the current scope via return, throw, break, or continue; values bound in a guard let stay available in the rest of the scope, unlike if let. This enables an early-exit style that keeps the happy path unindented. RED FLAG: thinking the guard else can simply continue without exiting the scope.
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- #swift
- #control-flow
- #guard
- #optionals
- #readability
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