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Update a running count
C++: Change a variable after its initial value has been assigned.
C++✓ Tested
Update a running count
C: Change a variable after its initial value has been assigned.
C✓ Tested
Use an alternate value only when a variable is nonempty
Bash Scripts: The colon-plus expansion returns its word only when the parameter has a nonempty value.
Bash Scripts✓ Tested
Wait for several deferred values
jQuery: when resolves only after every supplied deferred has resolved.
jQuery✓ Tested