(1. 10pts) Dynamic type binding is closely related to implicit heap dynamic vari
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(1. 10pts) Dynamic type binding is closely related to implicit heap dynamic variables. Explain this relationship. (2. 20pts) Consider the following JavaScript skeletal program: // The main program function sub1 var x; function sub20 function sub30 Assume the execution of this program is in the following unit order: main calls sub1 sub1 calls sub2 sub2 calls sub3 Assuming static scoping, in the following, which declaration of x is the correct one for a reference to x - sub1 -sub2 - sub3 Repeat the above question, but assume dynamic scopingExplanation / Answer
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Dynamic binding is closely related to implicit heap dynamic variables.
In order to explain this relationship, we must first understand what does dynamic binding and implicit heap dynamic variables mean.
First of all ,we start with dynamic binding.
A binding is an association which can be between an entity and an attribute or it can be between a symbol and an operation.By this, I mean it is an interconnection between two entities which binds them.This binding can be static or dynamic.
A binding is known as dynamic when it first occurs during the execution of the program or can change during the running of the program.A binding that takes place at run time of the program is known as the dynamic binding.
In Dynamic Type binding,the variable type is not specified by a declaration statement nor it can be determined by its name's spelling.
Variable is bound to a type when it is assigned a value during the course of the program through assignment statement using the assignment operator, i.e., "=" sign.
For example , in JS , it can be specified through below statement:
list = [8,12,56,89]
abc=45
Hence, Dynamic binding is the binding of a type to a variable at runtime or changing the type of a variable during runtime of the program.
On the other hand, Heap is defined by the section of your computer memory where all the variables which are created or initialised during the runtime of your program are stored.
When we dynamically create a variable or we assign and change the value of the existing variable, changes done needs to be stored somewhere so that we can use them afterwards during our program execution.These changes are stored in the heap.
Allocation and deallocation caused by the dynamic assignment of values to these variable or entities is know as Implicit heap dynamic.
Hence, these variables are known as Implicit heap dynamic variables.
Thus, the relationship between them can be specified by below statements.
Implicit heap dynamic variables use dynamic type binding.
Implicit heap dynamic variables acquire types only when assigned values at runtime.Therefore,these variables are always dynamically bound to types which is the concept of dynamic type binding.
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