1	#!/usr/bin/env bash
2	#
3	# Var refs are done with ${!a} and local/declare -n.
4	#
5	# http://stackoverflow.com/questions/16461656/bash-how-to-pass-array-as-an-argument-to-a-function
6
7	### var ref ${!a}
8	a=b
9	b=c
10	echo ref ${!a} ${a}
11	# Woah mksh has a completely different behavior -- var name, not var ref.
12	# stdout: ref c b
13	# BUG mksh stdout: ref a b
14	# N-I dash/zsh stdout-json: ""
15
16	### var ref with special vars
17	myfunc() {
18	local ref=$1
19	echo ${!ref}
20	}
21	myfunc FUNCNAME
22	myfunc '?' # osh doesn't do this dynamically
23	# stdout-json: "myfunc\n0\n"
24	# N-I mksh stdout-json: "ref\nref\n"
25
26	### declare -n and ${!a}
27	declare -n a
28	a=b
29	b=c
30	echo ${!a} ${a}
31	# stdout: b c
32	# N-I mksh stdout: a b
33
34	### Bad var ref with ${!a}
35	#set -o nounset
36	a='bad var name'
37	echo ref ${!a}
38	echo status=$?
39	# stdout-json: "ref\nstatus=0\n"
40	# BUG mksh stdout-json: "ref a\nstatus=0\n"
41	### pass array by reference
42	show_value() {
43	local -n array=$1
44	local idx=$2
45	echo "${array[$idx]}"
46	}
47	shadock=(ga bu zo meu)
48	show_value shadock 2
49	# stdout: zo
50
51	### pass assoc array by reference
52	show_value() {
53	local -n array=$1
54	local idx=$2
55	echo "${array[$idx]}"
56	}
57	days=([monday]=eggs [tuesday]=bread [sunday]=jam)
58	show_value days sunday
59	# stdout: jam
60	# BUG mksh stdout: [monday]=eggs
61	# mksh note: it coerces "days" to 0? Horrible.
62
63	### pass local array by reference, relying on DYNAMIC SCOPING
64	show_value() {
65	local -n array=$1
66	local idx=$2
67	echo "${array[$idx]}"
68	}
69	caller() {
70	local shadock=(ga bu zo meu)
71	show_value shadock 2
72	}
73	caller
74	# stdout: zo
75	# mksh appears not to hav elocal arrays!
76	# BUG mksh stdout-json: ""
77	# BUG mksh status: 1
78
79