### Re^2: qw() and lists of lists (literals)

 on Mar 14, 2013 at 00:24 UTC ( #1023329=note: print w/replies, xml ) Need Help??

in reply to Re: qw() and lists of lists
in thread qw() and lists of lists

there's no such thing as a list of lists. Lists never nest.

List literals never nest, a list of lists is an array of arrays

• Comment on Re^2: qw() and lists of lists (literals)

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Re^3: qw() and lists of lists (literals)
by chromatic (Archbishop) on Mar 14, 2013 at 06:01 UTC

Can you make a non-literal list of lists which doesn't nest?

Can you make a non-literal list of lists which doesn't nest?

Sure, apples and oranges, peas and carrots, chrome and ticks

Re^3: qw() and lists of lists (literals)
by ikegami (Pope) on Mar 14, 2013 at 23:20 UTC

List literals can be nested:

```(1,(2,3,(4,5)),6,7)

List operators can be nested:

```>perl -MO=Concise -e"@a=(1,(2,3,(4,5)),6,7)"
j  <@> leave[1 ref] vKP/REFC ->(end)
1     <0> enter ->2
2     <;> nextstate(main 1 -e:1) v:{ ->3
i     <2> aassign[t3] vKS ->j
-        <1> ex-list lKP ->f
3           <0> pushmark s ->4
4           <\$> const[IV 1] s ->5
c           <@> list lKP ->d             <-- This list...
5              <0> pushmark s ->6
6              <\$> const[IV 2] s ->7
7              <\$> const[IV 3] s ->8
b              <@> list lKP ->c          <-- ...has a list for operand
8                 <0> pushmark s ->9
9                 <\$> const[IV 4] s ->a
a                 <\$> const[IV 5] s ->b
d           <\$> const[IV 6] s ->e
e           <\$> const[IV 7] s ->f
-        <1> ex-list lK ->i
f           <0> pushmark s ->g
h           <1> rv2av[t2] lKRM*/1 ->i
g              <#> gv[*a] s ->h
-e syntax OK

List values can't be nested:

```>perl -E"say for (1,(2,3,(4,5)),6,7)"
1
2
3
4
5
6
7

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