Ruby symbol to class
There are many ways to do this. Your lack of context makes it impossible to elect a “best” way. Here’s a few ayways. Kernel.const_get(:Bob) eval(:Bob.to_s) Kernel.const_get(:bob.to_s.capitalize)
symbols
What is the difference between equality and equivalence?
Wikipedia: Equivalence relation: In mathematics, an equivalence relation is a binary relation between two elements of a set which groups them together as being “equivalent” in some way. Let a, b, and c be arbitrary elements of some set X. Then “a ~ b” or “a ≡ b” denotes that a is equivalent to b. … Read more
Why does Clojure distinguish between symbols and vars?
Other questions have touched on many true aspects of symbols, but I’ll try explaining it from another angle. Symbols are names Unlike most programming languages, Clojure makes a distinction between things and the names of things. In most languages, if I say something like var x = 1, then it is correct and complete to … Read more
What is bang dollar (!$) in Bash?
That’s the last argument of the previous command. From the documentation: !!:$ designates the last argument of the preceding command. This may be shortened to !$. Remark. If you want to play around with Bash’s history, I suggest you turn on the shell option histverify like so: shopt -s histverify (you can also put it … Read more
duplicate symbols for architectures in Xcode
Check your import files, it may that you’re importing a .m file. #import “TimeModel.m”
Microsoft equivalent of the nm command
Try dumpbin.exe. MSDN dumpbin.exe reference.
Inserting a degree symbol into python plot
Use LaTeX Style. For Example: $^\circ$ Text would produce °Text See the matplotlib documentation for more information about printing (especially mathematical expression). In your case the code has to be: plt.xlabel(‘Manufactured Ply Angle $^\circ$’) The TeX part of the expression must be enclosed by dollar signs “$”.
How to create Hash with string keys by default
Use hash rocket syntax: h = { “a” => 123 } #=> {“a”=>123} h[‘a’] #=> 123
Why is this string key in a hash converted to a symbol?
In Ruby 2.3(.0), these are all the same: {:”a” => 1} {“a”: 1}, {:a => 1} {a: 1} They all translate to the same thing: a is a symbol in all these cases. {“a”=>1} is different: a is a string in this case.