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Is there a way to pass optional parameters to a function?
...le calling it and in the function definition have some code based on "only if the optional parameter is passed"
5 Answers
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Best way to allow plugins for a PHP application
...eners;
$num_args = func_num_args();
$args = func_get_args();
if($num_args < 2)
trigger_error("Insufficient arguments", E_USER_ERROR);
// Hook name should always be first argument
$hook_name = array_shift($args);
if(!isset($listeners[$hook_name]))
return...
bool operator ++ and --
...
It comes from the history of using integer values as booleans.
If x is an int, but I am using it as a boolean as per if(x)... then incrementing will mean that whatever its truth value before the operation, it will have a truth-value of true after it (barring overflow).
However, it's impo...
Convert string to integer type in Go?
... s := flag.Arg(0)
// string to int
i, err := strconv.Atoi(s)
if err != nil {
// handle error
fmt.Println(err)
os.Exit(2)
}
fmt.Println(s, i)
}
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When do you need to explicitly call a superclass constructor?
...
You never need just
super();
That's what will be there if you don't specify anything else. You only need to specify the constructor to call if:
You want to call a superclass constructor which has parameters
You want to chain to another constructor in the same class instead of t...
Convert a PHP object to an associative array
...
Just typecast it
$array = (array) $yourObject;
From Arrays:
If an object is converted to an array, the result is an array whose elements are the object's properties. The keys are the member variable names, with a few notable exceptions: integer properties are unaccessible; private var...
Access object child properties using a dot notation string [duplicate]
...ar arr = desc.split(".");
while(arr.length && (obj = obj[arr.shift()]));
return obj;
}
console.log(getDescendantProp(r, "b.b2"));
//-> 99
Although there are answers that extend this to "allow" array index access, that's not really necessary as you can just specify numerical ind...
What is context in _.each(list, iterator, [context])?
...which is represented by this since we passed it as the context parameter.
If you do not set the context, then this will refer to the window object.
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How to detect Safari, Chrome, IE, Firefox and Opera browser?
...d to detect browsers by duck-typing.
Only use the browser detection method if it's truly necessary, such as showing browser-specific instructions to install an extension. Use feature detection when possible.
Demo: https://jsfiddle.net/6spj1059/
// Opera 8.0+
var isOpera = (!!window.opr &&...
Why git keeps showing my changes when I switch branches (modified,added, deleted files) no matter if
...before stashing. That said, I'm not sure you actually want to stash here - if you intend for those changes to be part of the branch you're switching away from, commit them. (If you intend to switch back to that branch and work on the changes more before committing them, then stash may be the right t...