(Quiz) Dynamic Type Binding

Dynamic Type Binding in programming

A variable is bound to a variable when it is assigned a value in an assignment statement.

True

False

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A variable can dynamically bind to

a type value in an assignment statement

different type values during program execution

a temporary type value

a memory cell

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Static Binding vs Dynamic Binding

When the type of a variable is bound, the name of the variable can be thought of being bound to a type, in the sense that the type and name of a variable are simultaneously bound. However, when a variable’s type is bound, its name can be thought of as being only temporarily bound to a type. In reality, the names of variables are never bound to types. Names can be bound to variables and variables can be bound to types.

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statically

dynamically

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Languages in which types are dynamically bound are dramatically different from those in which types are statically bound

The primary advantage of static binding of variables to types is that it provides more programming flexibility.

True

False

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A program to process numeric data

A program to process numeric data in a language that uses dynamic type binding can be written as a _________ program, meaning that it is capable of dealing with data of any numeric type.

exact

varied

generic

detailed

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Dramatic shift to languages that use dynamic type binding

Before the mid-1990s, the most commonly used programming languages used static type binding, the primary exceptions being some functional languages such as LISP. However, since then there has been a significant shift to languages that use dynamic type binding. In Python, Ruby, JavaScript, and PHP, type binding is dynamic.

True

False

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Way of assigning values JavaScript variables

It is possible in JavaScript to write two consecutive assignment statements like that

list = [10.2, 3.5];

list = 47;

True

False

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The option of dynamic type binding was introduced in C# 2010

True

False

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C# 2010 dynamic type declaration

A variable can be declared to use dynamic type binding by including the _________ reserved word in its declaration,

Missing

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In pure object-oriented languages—for example, Ruby—all variables are references and do not have types

True

False

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In pure object-oriented languages, all data are objects and any variable can reference any object

True

False

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Java variables vs Ruby variables

Unlike the references in Java, which are restricted to referencing specific type of value, variables in Ruby can reference object

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any

one

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There are two main disadvantages to dynamic type binding

It causes programs to be less reliable

Cost of implementing dynamic attribute binding is considerable

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Will JavaScript detect the keying error in the following example?

suppose that in a particular JavaScript program, i and x are currently the names of scalar numeric variables and y is currently the name of an array. Furthermore, suppose that the program needs the assignment statement

i = x;

but because of a keying error, it has the assignment statement

i = y;

Yes

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Assignment validation in static type binding

In languages that use static type binding such as C, C++ and Fortran, it happens in many cases that that type of the RHS is automatically converted to the type of the LHS of an assignment statement.

True

False

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Languages that use dynamic type binding are usually slower

True

False

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