The i inside your function is evaluated when the function is executed, not when you assign it to onload. Your for loop has already completed by the time any of your onload functions fire, so all of them see the final value N. To capture the current value of i, you need to pass it … Read more
The private functions are local variables and not part of any object. So, the […] notation for accessing a property is never going to work since there is no object the private functions are properties of. Instead, you could make two objects: private and public: var public = {}, private = {}; public.publicMethod = function(number, … Read more
This is a pretty standard problem with closures. When you do this: function(data, textStatus) { test(data, textStatus, idx); } You’re binding a reference to idx but not to the value of idx. So, by the time your callback gets called, the loop will have finished and idx will be 16 in all of the callbacks … Read more
No, it’s not the same thing. Consider when using instanceof: function C1() { return {}; } function C2() { } var c1 = new C1(); var c2 = new C2(); alert(c1 instanceof C1); // false; wha…? alert(c2 instanceof C2); // true, as you’d expect. Here’s a demo. So instead, create them by assigning to this, … Read more
This is a section of slebetman’s answer to the question javascript can’t access private properties that answers your question very well. The Stack: A scope is related to the stack frame (in Computer Science it’s called the “activation record” but most developers familiar with C or assembly know it better as stack frame). A scope … Read more
The problem is that ContentView is a struct, which means it’s a value type. You can’t pass that to a closure and mutate it. If you did, nothing would change, because the closure would have its own independent copy of the struct. Your problem is that you’ve mixed your View and your Model. There can … Read more
Can do, kinda sorta. But first, let’s disambiguate. -[NSObject isKindOfClass:] can tell you it’s a block, and that’s about it. E.g. I believe this line of code — ostensibly & unfortunately A BAD IDEA — will return YES for blocks on present Lion & iOS 5.x: [myBlock isKindOfClass:NSClassFromString(@”NSBlock”)] That won’t help you distinguish the block’s … Read more
You are basically creating a closure. In computer science, a closure is a first-class function with free variables that are bound in the lexical environment. Such a function is said to be “closed over” its free variables. Related reading: Closures: why are they so useful? A closure is simply a more convenient way to give … Read more
From JavaScript Closures Two one-sentence summaries: A closure is the local variables for a function – kept alive after the function has returned, or A closure is a stack-frame which is not deallocated when the function returns. (as if a ‘stack-frame’ were malloc’ed instead of being on the stack!) A very good article on closures … Read more
Swift 3: closure parameter attributes are now applied to the parameter type, and not the parameter itself Prior to Swift 3, the closure attributes @autoclosure and @noescape used to be attributes to the closure parameter, but are now attributes to the parameter type; see the following accepted Swift evolution proposal: SE-0049: Move @noescape and @autoclosure … Read more