I personally prefer to use lambdas in such a scenario, because imo it’s clearer and simpler and also doesn’t force you to write lots of wrapper methods if you don’t have control over the called method, but that’s certainly a matter of taste. That’s how you’d do it with a lambda (note there’s also some … Read more
For modern Javascript or Typescript: class Foo { reallyCoolMethodISwear(…args) { return args.length; } } function reallyCoolFunction(i, …args) { return args[i]; } const allHailTheLambda = (…args) => { return args.constructor == Array; }; const x = new Foo().reallyCoolMethodISwear(0, 1, 2, 3, 4); const y = reallyCoolFunction(3, 0, 1, 2, 3, 4, 5, 6); const z = … Read more
There are several different ways to check if an argument was passed to a function. In addition to the two you mentioned in your (original) question – checking arguments.length or using the || operator to provide default values – one can also explicitly check the arguments for undefined via argument2 === undefined or typeof argument2 … Read more
The solution is the binding of variables through closure. As a more basic example, here is an example function that receives and calls a callback function, as well as an example callback function: function callbackReceiver(callback) { callback(“Hello World”); } function callback(value1, value2) { console.log(value1, value2); } This calls the callback and supplies a single argument. … Read more
Yes. In current versions of JS you can use: app[func]( …args ); Users of ES5 and older will need to use the .apply() method: app[func].apply( this, args ); Read up on these methods at MDN: .apply() spread “…” operator (not to be confused with the related rest “…” parameters operator: it’s good to read up … Read more
If your $VARIABLE is a string containing spaces or other special characters, and single square brackets are used (which is a shortcut for the test command), then the string may be split out into multiple words. Each of these is treated as a separate argument. So that one variable is split out into many arguments: … Read more
A -exec command must be terminated with a ; (so you usually need to type \; or ‘;’ to avoid interpretion by the shell) or a +. The difference is that with ;, the command is called once per file, with +, it is called just as few times as possible (usually once, but there … Read more
In C: void foo() means “a function foo taking an unspecified number of arguments of unspecified type” void foo(void) means “a function foo taking no arguments” In C++: void foo() means “a function foo taking no arguments” void foo(void) means “a function foo taking no arguments” By writing foo(void), therefore, we achieve the same interpretation … Read more
Don’t forget about spaces: source=”” samples=(“”) if [ $1 = “country” ]; then source=”country” samples=”US Canada Mexico…” else echo “try again” fi
This is Bash-only: echo “${@: -1}”