How can I add emoji's to my code?

Answer 1

Depends on the programming language. Some languages have direct support for all unicode characters, and with others you have limitations and tricky ways. Emoji can usually be referred to by its unicode codepoint value, or shortcode.

🙂 U+1F642 :slightly_smiling_face:
http://📙.la/🙂
Emojipedia is a good place to look up these codes, and there are countless other reference sites too.
https://unicode.org/emoji/charts/emoji-list.html

Answer 2

Through unicode or in double quotation you can directly add the emoji.