There are two different characters involved here. One is the MICRO SIGN, which is the one on the keyboard, and the other is GREEK SMALL LETTER MU. To understand what’s going on, we should take a look at how Python defines identifiers in the language reference: identifier ::= xid_start xid_continue* id_start ::= <all characters in … Read more
It’s not necessary — Fortran didn’t reserve any words, so things like: if if .eq. then then if = else else then = if endif are complete legal. This not only makes the language hard for the compiler to parse, but often almost impossible for a person to read or spot errors. for example, consider … Read more
I was able to fix it by running “clean” under the “Product” menu in Xcode, and resetting the contents and settings in the simulator.
You can check it against the Object’s keys using Array.some which returns a bool. if(Object.keys(obj).some(function(k){ return ~k.indexOf(“addr”) })){ // it has addr property } You could also use Array.filter and check it’s length. But Array.some is more apt here.
To be clear, this question and answer are about using negative numbers for surrogate keys, not for natural keys. As far as I know, there are three reasons for considering it to be a bad practice. It violates the principle of least surprise. Some people assume all ID numbers are non-negative. Some people use negative … Read more
From what I’ve been able to figure out, it seems like this is the case: _ is used to indicate that the input variable is a throwaway variable/parameter and thus might be required or expected, but will not be used in the code following it. For example: # Ignore a value of specific location/index for … Read more
The only legal characters according to the standard are alphanumerics and the underscore. The standard does require that just about anything Unicode considers alphabetic is acceptable (but only as single code-point characters). In practice, implementations offer extensions (i.e. some do accept a $) and restrictions (most don’t accept all of the required Unicode characters). If … Read more
Static limits the scope of the variable to the same translation unit. A static global variable has internal linkage. A non-static global variable has external linkage. Good Read: What is external linkage and internal linkage?