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@AlexPl292 @ddadon10

Some examples of join command with ideajoin option enabled.
Put set ideajoin to your ~/.ideavimrc to enable this functionality.

Now, you can press J (shift+j) on a line or a selected block of text to join the lines together.

  • Automatic join concatenated lines:
"Hello" +                 ->       "Hello world"
" world!"
  • Nested if's:
if (a) {                  ->       if (a && b) {
  if (b) {                             ...
     ...                           }
  }
}
  • Comments:
// Hello                  ->       // Hello world
// world
  • Remove braces from one line for / if / while:
if (fail) {               ->       if (fail) return;
     return;
}
  • Kotlin one line method:
fun myNumber(): Int {     ->       fun myNumber(): Int = 42
    return 42
}
  • Join declaration and initialization:
int a;                    ->       int a = 5;
a = 5;
  • Chain call:
sb.append("a");           ->       sb.append("a").append("b");
sb.append("b");

And other features provided by the plugins.