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Why is initialization needed?
Initializing a variable as Telastyn pointed out can prevent bugs. If the variable is a reference type, initializing it can prevent null reference errors down the line. A variable of any type that has a non null default will take up some memory to store the default value.
What is the difference between declaration and initialization?
Variables are explicitly initialized if they are assigned a value in the declaration statement. When initializing variables, the initial value is optional depending on the data type of the variable. Generally, all variables should be explicitly initialized in their declaration.
What is pointer initialization?
Pointer Initialization is the process of assigning address of a variable to a pointer variable. It contains the address of a variable of the same data type. In C language address operator & is used to determine the address of a variable.
Is initialization mandatory in Java?
Historically, when a new variable was created it would contain random values from the memory [and one could not predict the value]. Java also requires this because it prevents the presence of orphaned variables. In practice all variables need to be initialized before using them.
Where does the initialization of a variable take place?
Initialization of a variable provides its initial value at the time of construction. The initial value may be provided in the initializer section of a declarator or a new expression. It also takes place during function calls: function parameters and the function return values are also initialized.
When does static initialization take place in a compiler?
Static initialization. In practice, constant initialization is usually performed at compile time, and pre-calculated object representations are stored as part of the program image. If the compiler doesn’t do that, it still has to guarantee that this initialization happens before any dynamic initialization.
How is the initial state of a component defined?
Unlike props, the Component state is an internal object that is not defined by outside values. To define the initial state depends on how you declare your Component. For ES6 we declare the state in the constructor.
When does dynamic initialization happen in a function?
It is implementation-defined whether dynamic initialization happens-before the first statement of the main function (for statics) or the initial function of the thread (for thread-locals), or deferred to happen after.