variables

问题 In xCode 3, I defined private instance variables in a class. When I directly access the private variables in the client codes, why does the compiler just show me a warning, not an error? The code can still run. The warning says this maybe a hard error in the future. What does the "hard error" mean? Thanks. 回答1: Hard Error means that sometime in the future the compiler will behave the way you expect it to behave (i.e., it won't compile the source file when you directly access an instance

问题 I'm writing a divides-by-three function in Bash, and it won't let me set a variable to a number. fizzy.sh: #!/usr/bin/env sh div3() { return `$1 % 3 -eq 0` } d=div3 1 echo $d Example: $ ./fizzy.sh ./fizzy.sh: line 7: 1: command not found 回答1: Bash functions normally "return" values by printing them to standard output, where the caller can capture them using `func args ...` or $(func args ...) This makes functions work like external commands. The return statement, on the other hand, sets the

问题 I have a class with member variables. What is the syntax in PHP to access the member variables from within the class when the class is being called from a static context? Basically I want to call a class method (but not create a new object), but when the class method is called, I want a handful of static constant variables to be initialized that need to be shared among the different class methods. OR if there's a better way to do it then what I'm proposing, please share with me (I'm new to

问题 I have a class with member variables. What is the syntax in PHP to access the member variables from within the class when the class is being called from a static context? Basically I want to call a class method (but not create a new object), but when the class method is called, I want a handful of static constant variables to be initialized that need to be shared among the different class methods. OR if there's a better way to do it then what I'm proposing, please share with me (I'm new to

问题 How can I convert a JavaScript variable (not JSON format) into a python variable? Example JavaScript variable: { title: "TITLE", name: "NAME", active: false, info: { key1: "value1", dict1: { sub_key1: "sub_value1", sub_key2: "sub_value2", }, dict2: { sub_key3: "sub_value3", sub_key4: "sub_value4", sub_key5: "sub_value5" }, }, list1: ["element1", "element2", "element2"], } 回答1: This format looks just like the input in this question. Try adapting the pyparsing parser I posted there. 回答2:

问题 My Problem is that the action's variables are not being populated after it is triggered from the interceptor using invocation.invoke. What i know is that before using an interceptor , it worked properly (From a .jsp i submitted a form and an action is called and every variable was populated) Interceptor class: public String intercept(ActionInvocation invocation) throws Exception { final ActionContext context = invocation.getInvocationContext(); HttpServletRequest request = (HttpServletRequest

问题 How do I constantly check a variables value. For example: if(variable == 'value'){ dosomething(); } This would work if I constantly looped it or something, but is there an efficient way of triggering that as soon as the variable is set to that value? 回答1: Object.watch: Watches for a property to be assigned a value and runs a function when that occurs. Object.watch() for all browsers? talks about cross-browser ways to do Object.watch on browsers that don't support it natively. 回答2: Object

问题 How this simple task can be done in Ruby? I have some simple config file === config.rb config = { 'var' => 'val' } I want to load config file from some method, defined in main.rb file so that the local variables from config.rb became local vars of that method. Something like this: === main.rb Class App def loader load('config.rb') # or smth like that p config['var'] # => "val" end end I know that i can use global vars in config.rb and then undefine them when done, but i hope there's a ruby

问题 How this simple task can be done in Ruby? I have some simple config file === config.rb config = { 'var' => 'val' } I want to load config file from some method, defined in main.rb file so that the local variables from config.rb became local vars of that method. Something like this: === main.rb Class App def loader load('config.rb') # or smth like that p config['var'] # => "val" end end I know that i can use global vars in config.rb and then undefine them when done, but i hope there's a ruby

问题 I want to do something similar to How to pass a Javascript variable to Rails Controller? but I can't seem to get it working for my purposes. I'm using drag and drop jQuery to transfer "items" to "pods". Here's my code: function onReceive(id,pod_id){ var id = id; var pod_id = pod_id; confirm("Add " +id + " to " + pod_id + "?"); } What I want to do is really something like this: function onReceive(id,pod_id){ <% @pod_id = pod_id %> <% @id = id %> } But I know that the solution isn't quite that