Vim (vimscript) get exact character under the cursor

Question

I am getting the character under the cursor in vimscript the following way:

getline(\'.\')[col(\'.\')-1] 

It works exactly like it should,

Answer 1

nr2char(strgetchar(getline('.')[col('.') - 1:], 0))

or

strcharpart(getline('.')[col('.') - 1:], 0, 1)