Problem Statement

Given two ranges:   where:

Write a function/subroutine/... that takes two ranges and a real number, and returns the mapping of the real number from the first to the second range. Use this function to map values from the range   [0, 10]   to the range   [-1, 0].

Show additional idiomatic ways of performing the mapping, using tools available to the language.

Let's start with the solution:

 
mapRange(a1, a2, b1, b2, s)
{
	return b1 + (s-a1)*(b2-b1)/(a2-a1)
}

out := "Mapping [0,10] to [-1,0] at intervals of 1:`n"

Loop 11
	out .= "f(" A_Index-1 ") = " mapRange(0,10,-1,0,A_Index-1) "`n"
MsgBox % out