(Quiz) Dynamic Type Binding

Dynamic Type Binding in programming

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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

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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

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When the type of a variable is (1) 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 (2) 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

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

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A program to process numeric data

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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

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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

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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

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True

False

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C# 2010 dynamic type declaration

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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

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True

False

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

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True

False

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Java variables vs Ruby variables

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Unlike the references in Java, which are restricted to referencing (1) specific type of value, variables in Ruby can reference (2) object

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any

one

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There are two main disadvantages to dynamic type binding

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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?

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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

No

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Assignment validation in static type binding

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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

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True

False

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Dynamic Type Binding in programming

Correct Answer

Explanation

A variable can dynamically bind to

Correct Answer

Explanation

Static Binding vs Dynamic Binding

Correct Answer

Explanation

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

Correct Answer

Explanation

A program to process numeric data

Correct Answer

Explanation

Dramatic shift to languages that use dynamic type binding

Correct Answer

Explanation

Way of assigning values JavaScript variables

Correct Answer

Explanation

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

Correct Answer

Explanation

C# 2010 dynamic type declaration

Correct Answer

Explanation

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

Correct Answer

Explanation

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

Correct Answer

Explanation

Java variables vs Ruby variables

Correct Answer

Explanation

There are two main disadvantages to dynamic type binding

Correct Answer

Explanation

Will JavaScript detect the keying error in the following example?

Correct Answer

Explanation

Assignment validation in static type binding

Correct Answer

Explanation

Languages that use dynamic type binding are usually slower

Correct Answer

Explanation

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