[bmn__]

"my" is 33% shorter than "let"

Example 1 and 3 are not declarations, so apples ↔ oranges

[yossi_peti]

Example 1 is a declaration in Go. Example 3 is a declaration in Python.

[j_w]

my $x = 42;

let x = 42

Well, when you add in the '$' and ';' tokens the "let" example is still shorter. Also as another person replied to you, those other two examples are declarations in other languages. So 0 for 3 there.