Class methods don’t really exist in Ruby, they are just singleton methods of the class object. Singleton methods don’t really exist, either, they are just ordinary instance methods of the object’s singleton class. Since you already know how to define instance methods (using Module#define_method), you already know everything you need to know. You just need … Read more
Well you can do it like : let formattedArray = ([0,1,1,0].map{String($0)}.joined(separator: “,”)
You’re not keeping the element you’ve created around and referenced anywhere – that’s why you’re not seeing the memory usage increase. Try attaching the element to the DOM, or store it in an object, or set the onclick to be a different element that sticks around. Then you’ll see the memory usage skyrocket. The garbage … Read more
Free variables are simply the variables that are neither locally declared nor passed as parameter. Source : In computer programming, the term free variable refers to variables used in a function that are not local variables nor parameters of that function.1 The term non-local variable is often a synonym in this context. In javascript closures, … Read more
The only way to truly get access to function a‘s private scope is to declare b inside of a so it forms a closure that allows implicit access to a‘s variables. Here are some options for you. Direct Access Declare b inside of a. function a() { var x = 5, obj = {}; function … Read more
Closures are something like the context of a function when it is defined. Whenever a function is defined, the context is stored, and even if the ‘normal’ life cycle of your function is over, if you keep a reference to an element defined whithin your function execution, it can still access to elements of the … Read more
The ‘part 2’ closure captures the variable ‘i’. When the code in the closure (later) executes, the variable ‘i’ has the value which it had in the last iteration of the range statement, ie. ‘4’. Hence the 4 4 4 4 4 part of the output. The ‘part 3’ doesn’t capture any outer variables in … Read more
I only use closures where I need them, i.e. I use methods by default. I do this because Methods are simpler than closures. Closures have a delegate, an owner, retain access to variables that were in their local scope when created (what you call “free variables”). By default method calls within a closure are resolved … Read more
There is an interesting way to do it that does rely neither on rebinding nor the behavior of def. The main trick is to go around the limitations of recursion by passing a function as an argument to itself: (defn make-fibo [y] (let [fib (fn [mem-fib x] (let [fib (fn [a] (mem-fib mem-fib a))] (if … Read more