Answered: Explain what the map function does in a…

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

Problem 1PE

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1.14 Explain what the map function does in a functional language. How does it provide additional abstraction capability in a programming language?

Expert Solution

Step 1

The map function builds and returns a list of the results got by applying the argument function to every element in the argument list.

The function expects another function and a collection, like a list as arguments.

Step 2

Example using Lisp:

The first argument to the map is the function abs, which returns the absolute value of its arguments. The second argument to map is a list generated by the function list.

(map abs (list 33 -10 66 88 -4) ) ; Returns (33 10 66 88 4)

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