#!/usr/bin/env zsh

# @(#) z1       Demonstrate feature.

set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && zsh $C
set -o nounset

FILE=${1-data1}

pl " Input file $FILE:"
head $FILE

# IFS=$'\n,'; h=($(<file.csv))
# https://unix.stackexchange.com/questions/464626/making-associative-array-based-on-another-associative-array
# Printing advice from:
# http://zsh.sourceforge.net/Guide/zshguide05.html#l122
pl " Results:"
typeset -A a
IFS=$'\n,\t='; a=($(<$FILE))

pe;pe " Plain print:"
print ${a}
pe;pe " Values:"
print ${(v)a}
pe;pe " Keys:"
print ${(k)a}
pe;pe " Both vertically:"
print -l "${(@kv)a}"

exit 0

$ ./z1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Apple/BSD, Darwin 18.7.0, x86_64
Distribution        : macOS 10.14.6 (18G103), Mojave
zsh 5.3

-----
 Input file data1:
red=stop
green=go
yellow=caution

-----
 Results:

 Plain print:
caution stop go

 Values:
caution stop go

 Keys:
yellow red green

 Both vertically:
yellow
caution
red
stop
green
go