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F.1.5 Eval Expression

‘eval-expression’

‘M-:’

Evaluate EXP and print value in the echo area.

When called interactively, read an Emacs Lisp expression and evaluate it. If invoked with the universal argument ‘C=u’, the output of the expression is inserted into the buffer.

It evaluates code in the context of the buffer it is invoked from.

‘repeat-complex-command’

‘C-x M-:’

Edit and re-evaluate last complex command, or ARGth from last. A complex command is one that used the minibuffer. The command is placed in the minibuffer as a Lisp form for editing. The result is executed, repeating the command as changed.

You can use the minibuffer history commands M-n and M-p to get different commands to edit and resubmit.