vim: delete all blank space until next non-blank character

Question

Say I have the following code:

    Hello

And I want to make it

Hello

Answer 1

There's a tag text-object in vim:

• put cursor within tag, press vat to select entire tag
• press :, it becomes :'<,'>
• type j, it becomes :'<,'>j
• press Enter to join lines

---

:help v_at

at          "a tag block", select [count] tag blocks, from the
            [count]'th unmatched "<aaa>" backwards to the matching
            "</aaa>", including the "<aaa>" and "</aaa>".
            See |tag-blocks| about the details.
            When used in Visual mode it is made characterwise.

Answer 2

One way when you won't need to repeat this action many times.

JxJx

Explanation:

J           # Join current line with next one but substitute end of line with a space.
x           # Remove the space.
Jx          # Repeat same process for last line.

Answer 3

When standing anywhere in the second line (the one that says Hello), press the following keys: ^d0vatgJ. Simply explained:

1. ^ will go to the first non-whitespace character, H
2. d0 will delete to the beginning of the line
3. vat will select the entire tag
4. gJ will join all the lines without inserting spaces

If you start on the H, you can skip the ^ part.