const regex = new RegExp(`ReGeX${testVar}ReGeX`); … string.replace(regex, “replacement”); Update Per some of the comments, it’s important to note that you may want to escape the variable if there is potential for malicious content (e.g. the variable comes from user input) ES6 Update In 2019, this would usually be written using a template string, and the … Read more
My rule of thumb is: Use pointers if you want to do pointer arithmetic with them (e.g. incrementing the pointer address to step through an array) or if you ever have to pass a NULL-pointer. Use references otherwise.
Reading the docs I find the section Passing Variables On The Command Line, that gives this example: ansible-playbook release.yml –extra-vars “version=1.23.45 other_variable=foo” Others examples demonstrate how to load from JSON string (≥1.2) or file (≥1.3)
Between those two syntaxes, you should really choose the one you prefer 🙂 Personally, I would go with your second solution in such a case (Variable interpolation), which I find easier to both write and read. The result will be the same; and even if there are performance implications, those won’t matter 1. As a … Read more
Here is what is going on. First, the only global variables Python really has are module-scoped variables. You cannot make a variable that is truly global; all you can do is make a variable in a particular scope. (If you make a variable inside the Python interpreter, and then import other modules, your variable is … Read more
My guess is that the compiler version you’re using follows the memory management rules for declared properties, too — more specifically, for declared properties’ accessors: You take ownership of an object if you create it using a method whose name begins with “alloc”, “new”, “copy”, or “mutableCopy”. A property named newTitle, when synthesised, yields a … Read more
You can use ARG – see https://docs.docker.com/engine/reference/builder/#arg The ARG instruction defines a variable that users can pass at build-time to the builder with the docker build command using the –build-arg <varname>=<value> flag. If a user specifies a build argument that was not defined in the Dockerfile, the build outputs an error. Can be useful with … Read more
You were right in thinking mod was a good place to start. Here is an expression which will return true if $number is even, false if odd: $number % 2 == 0 Works for every integerPHP value, see as well Arithmetic OperatorsPHP. Example: $number = 20; if ($number % 2 == 0) { print “It’s … Read more
It’s by value according to the PHP Documentation. By default, function arguments are passed by value (so that if the value of the argument within the function is changed, it does not get changed outside of the function). To allow a function to modify its arguments, they must be passed by reference. To have an … Read more
If it’s a global variable then window[variableName] or in your case window[“onlyVideo”] should do the trick.