Test for existence of nested JavaScript object key
Test for existence of nested JavaScript object key
properties
How can I access an array/object?
To access an array or object you how to use two different operators. Arrays To access array elements you have to use []. echo $array[0]; On older PHP versions, an alternative syntax using {} was also allowed: echo $array{0}; Difference between declaring an array and accessing an array element Defining an array and accessing an … Read more
How to use a variable for a key in a JavaScript object literal?
{ thetop : 10 } is a valid object literal. The code will create an object with a property named thetop that has a value of 10. Both the following are the same: obj = { thetop : 10 }; obj = { “thetop” : 10 }; In ES5 and earlier, you cannot use a … Read more
Dynamically access object property using variable
There are two ways to access properties of an object: Dot notation: something.bar Bracket notation: something[‘bar’] The value between the brackets can be any expression. Therefore, if the property name is stored in a variable, you have to use bracket notation: var something = { bar: ‘foo’ }; var foo = ‘bar’; // both x … Read more
What’s the difference between the atomic and nonatomic attributes?
The last two are identical; “atomic” is the default behavior (note that it is not actually a keyword; it is specified only by the absence of nonatomic — atomic was added as a keyword in recent versions of llvm/clang). Assuming that you are @synthesizing the method implementations, atomic vs. non-atomic changes the generated code. If … Read more
How do I remove a property from a JavaScript object?
How do I remove a property from a JavaScript object?
the value of the property “if” is null or undefined, not a Function object [closed]
You have an upper case “I” in If (…. Change it to lower case: if (…. JavaScript is case-sensitive.
Define if statement for property in C# [closed]
value is an array of integer, it can’t be zero. Any element in the array could be zero. If you are trying to determine if the array is null, then you could change the check to be: if (value == null) { Environment.Exit(1); }
Can a property of a class be the class itself? [closed]
Yes it can have, this is called self-referencing class. Why it is not a compiler issue ? Because you create a pointer to the object of same type, not the object. This is frequently seen in C / C++ data structures like Linked List.
C# software freezing when setting property to true
Windows forms have a UI thread. This thread is responsible for updating the UI, and handling UI related events. If this thread ever becomes blocked then your UI will become unresponsive. The timer tick event is handled by this UI thread, so when you start a long loop inside this event handler the UI thread … Read more