Tip 23: Prefer Operators to Visual Commands Where Possible

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U: converts the selected character to uppercase.

Example: Uppercasing in Visual Mode

References:

# If you open the vimwiki file in vim,
# then you can \"ayy@a the next line to execute the vim command: 
:h v_U

Using a Visual Operator

When a Visual mode command is repeated, it affects the same range of text.

Example: problem raises when using j.

References:

# If you open the vimwiki file in vim,
# then you can \"ayy@a the next line to execute the vim command: 
:h visual-repeat

Using a Normal Operator

The Visual mode U command has a Normal mode equivalent: gU{motion}.

Example:

References:

# If you open the vimwiki file in vim,
# then you can \"ayy@a the next line to execute the vim command: 
:h gU