handle lines in region or not

Question

I have N lines with code like this:

let aafdafa
let bfaf
let cb

I want translate this code to this:

let aafdafa = aafdafa.len();
let bfaf = bfaf.len();
let cb = cb.len();

replace-regexp not work with selection, how should I solve this task in emacs?

Answer 1

This would be a task for an Emacs Macro: https://www.emacswiki.org/emacs/KeyboardMacros

Macros are built-in powerful features to record and repeat key strokes. You could:

1. Go to the beginning of the line
2. Jump one word (to the var) and yank it
3. Add an =
4. Paste the var
5. Add .len();

And then repeat n times.