5.18.1 Top new questions this week

5.18.1.1 pic versus macro in TikZ

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=492585

Consider this code in the TikZ - PGF manual, which uses a macro 
% Main code from 
% The TikZ - PGF manual 
%   Author: Till Tantau et al 
%   Version 3.1.3, released May 9, 2019 
%   Page 40 
... 
[tikz-pgf] [macros] [tikz-pic]
 

asked by The old JouleV https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=156344 14 votes

answered by marmot https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=121799 11 votes

5.18.1.2 Draw a checker pattern with a black X in the center

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=492863

I am trying to recreate the following image in TikZ 
Using some old code I was able to produce the following result 
While I was able to produce the correct result, I feel that my solution was a  ... 
[tikz-pgf] [code-review]
 

asked by N3buchadnezzar https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=8306 12 votes

answered by Zarko https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=18189 15 votes

5.18.1.3 What's the Difference between Two Single-Quotes and One Double-Quote?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=492726

As you would know, LaTeX uses ` for opening quotes and ' for closing quotes. Most fonts also allow the usage of " for closing doublequotes. My question is: what are the differences in typesetting,  ... 
[symbols]
                                                                                  

                                                                                  
 

asked by K. Paul https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=161388 10 votes

answered by David Carlisle https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=1090 13 votes

5.18.1.4 Question about exercise 11.5 in TeXbook

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=492807

In answer to exercise 11.5 there is this comment: 
\def\\{\if\space\next\ % assume that \next is unexpandable 
What does this comment mean? If \next may be expandable, 
must we use the following  ... 
[tex-core] [conditionals] [expansion]
 

asked by Igor Liferenko https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=70900 9 votes

answered by frougon https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=73317 10 votes

5.18.1.5 Why does a perfectly-identical repetition of a drawing command given within an earlier loop eth\235\230\257eth\235\230Degreeeth\235\230\[Micro] produce exactly the same line?

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=492625

Question. Why does the following code produce a line from vertex 0 to vertex 1 which does not perfectly coincide with the analogous line drawn earlier (by way of the foreach-loop)? 
... 
[tikz-pgf] [foreach] [technical-drawing] [tikz-graphdrawing]
 

asked by Peter Heinig https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=133810 9 votes

answered by marmot https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=121799 14 votes

5.18.1.6 How to make \  and \  automatically have \left and \right

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=492904

Desired behavior 
\{ and \} should turn into \left\{ and \right\{. 
Attempt 1 
\edef\{{\left\{} 
\edef\}{\right\}} 
Error message 
TeX capacity exceeded, sorry [input stack size=5000]. 
\font@name  ... 
[macros] [brackets]
 

asked by Solomon Ucko https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=157414 8 votes

answered by Boris https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=5522 6 votes

5.18.1.7 Understanding Implicit Delimiters/Terminators

https://tex.stackexchange.com/landing/r/newsletter?cta=question&id=492443

[I encourage you to check out Phelype's impressive approach] 
I hear about macros that do things like "expand until they reach an unexpandable token" and this question may (or may not) be related to  ... 
[tex-core] [delimiters] [token-lists]
 

asked by Steven B. Segletes https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=25858 7 votes

answered by Phelype Oleinik https://tex.stackexchange.com/landing/r/newsletter?cta=user&id=134574 4 votes