... It's shorthand for tags.map(&:name.to_proc).join(' ') If foo is an object with a to_proc method, then you can pass it to a method as &foo, which will call foo.to_proc and use that as the method's block. The Symbol#t...

...nteger.toString(i) or String.valueOf(i). The concatenation will work, but it is unconventional and could be a bad smell as it suggests the author doesn't know about the two methods above (what else might they not know?). Java has special support for the + operator when used with strings (see the d...

...e used for different purposes. When you encode text in ASCII, you start with a text string and convert it to a sequence of bytes. When you encode data in Base64, you start with a sequence of bytes and convert it to a text string. To understand why Base64 was necessary in the first place we need...

How do you auto-indent your code in the Atom editor? In other editors you can usually select some code and auto-indent it. ...

... As a general rule (i.e. in vanilla kernels), fork/clone failures with ENOMEM occur specifically because of either an honest to God out-of-memory condition (dup_mm, dup_task_struct, alloc_pid, mpol_dup, mm_init etc. croak), or because security_vm_enough_memory_mm failed you while enforcing t...

...ssions because they're slow, but rather because they're hard to read and write, as well as tricky to get right. While there are some situations where regular expressions provide an effective, compact solution to the problem, they are sometimes shoehorned into situations where it's better to use an e...

... If you're expecting a Single record, it's always good to be explicit in your code. I know others have written why you use one or the other, but I thought I'd illustrate why you should NOT use one, when you mean the other. Note: In my code, I will typically use F...

... The yield keyword actually does quite a lot here. The function returns an object that implements the IEnumerable<object> interface. If a calling function starts foreaching over this object, the function is called again until it "yields". This is syntac...

...vigationController? Swift classes require non-optional properties to be initialized during the instantiation: Classes and structures must set all of their stored properties to an appropriate initial value by the time an instance of that class or structure is created. Stored properties cannot be le...

...tract 128 from (Integer) instead of casting -128 to Integer. Add () to fix it Integer i3 = (Integer) -128; // doesn't compile Integer i3 = (Integer) (-128); // compiles According to BoltClock in the comments the cast to int works as intended, because it is a reserved word and therefore can't be ...