It really depends on where your JavaScript code is located. The problem is probably caused by the DOM not being loaded when the line var systemStatus = document.getElementById(“system-status”); is executed. You could try calling this in an onload event, or ideally use a DOM ready type event from a JavaScript framework.
You need to initialize it with an empty map: var ir_MAP = map[int]ir_table{} or, as “the system” suggested: var ir_MAP = make(map[int]ir_table) The problem is that the zero value of a map is nil, and you can’t add items to a nil map.
If you are running two separate processes, then they won’t be sharing the same globals. If you want to pass the data between the processes, look at using send and recv. Take a look at http://docs.python.org/library/multiprocessing.html#sharing-state-between-processes for an example similar to what you’re doing.
Here is what the book says on page 205: If you’re familiar with operating system architecture, you might be interested to know that local variables and function arguments are stored on the stack, while global and static variables are stored on the heap. This is definitely an error in the book. First, one should discuss … Read more
Global variables are not extern nor static by default on C and C++. When you declare a variable as static, you are restricting it to the current source file. If you declare it as extern, you are saying that the variable exists, but are defined somewhere else, and if you don’t have it defined elsewhere … Read more
By static and global objects, I presume you mean objects with static lifetime defined at namespace scope. When such objects are defined with local scope, the rules are slightly different. Formally, C++ initializes such variables in three phases: 1. Zero initialization 2. Static initialization 3. Dynamic initialization The language also distinguishes between variables which require … Read more
Here is a better way to do it: import sys definitions = {‘a’: 1, ‘b’: 2, ‘c’: 123.4} module = sys.modules[__name__] for name, value in definitions.iteritems(): setattr(module, name, value)
If you’re declaring a global variable, you might want to use a namespace of some kind. Just declare the namespace outside, then you can throw whatever you want into it. Like this… var MyProject = {}; $(document).ready(function() { MyProject.intro = “”; MyProject.intro = “something”; }); console.log(MyProject.intro); // “something”
Yes, maybe not in general. However you can do it with functions. The thing you want to do is to have the function’s global to be empty. You can’t replace the globals and you don’t want to modify it’s content (becaus that would be just to get rid of global variables and functions). However: you … Read more