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Associative array entries order differs from declaration
From: |
Léa Gris |
Subject: |
Associative array entries order differs from declaration |
Date: |
Thu, 15 Aug 2019 17:26:03 +0200 |
User-agent: |
Telnet/1.0 [tlh] (PDP11/DEC) |
While dealing with getting keys of arrays, I found out that associative
array keys where not registered in the same order as declared:
#!/usr/bin/env bash
# Declare and populate an associative array a
unset a
declare -A a=(
["one"]="first"
["two"]="second"
["three"]="third"
["four"]="last")
)
typeset -p a # show actual declaration order that differs from real one
# Show how the chaotic order affect iteration of the array
for v in "${a[@]}"; do
echo "$v"
done
Output:
declare -A a=([two]="second" [three]="third" [four]="last" [one]="first"
second
third
last
first
This behavior looks just wrong and it is just same if you build the
array incrementally:
unset a; declare -A a; a=(["one"]="first"); a+=(["two"]="second");
a+=(["three"]="third"); a+=(["four"]="last"); typeset -p a
Is there a way to control the order of entries in an associative array?
What rules applies to the order of entries?
--
Léa Gris
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