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Associative array/Iteration: Difference between revisions
→{{header|AWK}}: gawk allows sorting
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=={{header|AWK}}==
In AWK "arrays" are always associative arrays, and the only way to iterate over them is by keys (''indexes'' in the AWK terminology), in undefined order.
<lang awk>BEGIN {
a["hello"] = 1
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a["!"] = 3
# iterate over keys, undefined order
for(key in a) {
print key, a[key]
}
}</lang>
As AWK was often used in (Bourne) shell scripts,
sorting was done by a pipe of two awk programs and the sort command.
Today, 'gawk' allows to set the order of iteration:
<lang awk>BEGIN {
a["hello"] = 1
a["world"] = 2
a["!"] = 3
PROCINFO["sorted_in"] = "@ind_str_asc" # controls index order
# iterate over keys, indices as strings sorted ascending
for(key in a) {
print key, a[key]
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