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1. The concept of first class objects is fundamental for Scheme programming. In particular, in Scheme functions are first class objects. The main properties of functions as first class objects are exemplified by answering the following questions: (a) The first class object may be expressed as an anonymous literal value (constant). Show an example of the anonymous function and its use. (b) The first class object may be stored in variables (i.e. it may have a symbolic name). Show examples of defining and using named functions. (c) The first class object may be stored in data structures. Show an example of a data structure(e.g. a list) that contains functions

1. The concept of first class objects is fundamental for Scheme programming. In particular, in Scheme functions are first class objects. The main properties of functions as first class objects are exemplified by answering the following questions: (a) The first class object may be expressed as an anonymous literal value (constant). Show an example of the anonymous function and its use. (b) The first class object may be stored in variables (i.e. it may have a symbolic name). Show examples of defining and using named functions. (c) The first class object may be stored in data structures. Show an example of a data structure(e.g. a list) that contains functions

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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1. The concept of first class objects is fundamental for Scheme programming. In particular, in Scheme functions are first class objects. The main properties of functions as first class objects are exemplified by answering the following questions: (a) The first class object may be expressed as an anonymous literal value (constant). Show an example of the anonymous function and its use. (b) The first class object may be stored in variables (i.e. it may have a symbolic name). Show examples of defining and using named functions. (c) The first class object may be stored in data structures. Show an example of a data structure(e.g. a list) that contains functions (d) The first class object may be comparable to other objects for equality. Show an example of comparing functions and lists for equality. (e) The first class object may be passed as parameter to procedures/functions. Show an example of passing function as an argument to another function. (f) The first class object may be returned as result from procedures/functions. Show an example of returning a function as a result of another function. (g) The first class object may be readable and printable. Show examples of reading function(s) from the keyboard, reading function(s) from a file, and displaying a function.
Transcribed Image Text:1. The concept of first class objects is fundamental for Scheme programming. In particular, in Scheme functions are first class objects. The main properties of functions as first class objects are exemplified by answering the following questions: (a) The first class object may be expressed as an anonymous literal value (constant). Show an example of the anonymous function and its use. (b) The first class object may be stored in variables (i.e. it may have a symbolic name). Show examples of defining and using named functions. (c) The first class object may be stored in data structures. Show an example of a data structure(e.g. a list) that contains functions (d) The first class object may be comparable to other objects for equality. Show an example of comparing functions and lists for equality. (e) The first class object may be passed as parameter to procedures/functions. Show an example of passing function as an argument to another function. (f) The first class object may be returned as result from procedures/functions. Show an example of returning a function as a result of another function. (g) The first class object may be readable and printable. Show examples of reading function(s) from the keyboard, reading function(s) from a file, and displaying a function.
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