Xah Talk Show 2020-01-08 Unicode Issues in Programing Languages Golang Python Ruby JavaScript Java emacs lisp

topics talked:

• golang demo. and live coding. modify the find replace script, so that it prints the list of find replace string pairs each in separate lines.
• Golang: Regex Find Replace Text in Directory 📜
• Golang Tutorial
• file encoding declaration convention -*- coding: utf-8; mode: xah-find-output -*-
• what are the issues of unicode in a programing language
• the encoding of the source code. what encoding is allowed or required for language x? if the language allows a choice of encoding, then how do you declare such encoding?
• Unicode for Programers
• Python: Unicode 🐍
• Ruby: Unicode Tutorial 💎
• Perl: Unicode Tutorial 🐪
• console.log ( "😂".length === 2); // true
• JS: String Overview
• JS: Character, Code Unit, Codepoint
• Golang: String
• how does programing language X deal with strings? In general, different language have completely totally different approach on how to deal with strings?
• For example, what is a string? in JavaScript and java, a string is a sequence of 16bits values. in python3 and elisp, a string is a sequence of unicode characters. (by the way, what is a character?) in golang and python2, a string is a sequence of 8 bits bytes.
• Programing Language: Unicode Math Symbols in Function Name and Operator
• Σ codepoint 931
• ∑ codepoint 8721