Re: Array concat quiz

[Timon Gehr]

On 12/17/2011 02:43 AM, bearophile wrote:

A small quiz. This Python2 code:

m1 = [[A', B']]
print m1
m2 = m1 + [[]]
print m2


Prints:

[[A', B']]
[[A', B'], []]


What does this D2 program print?

import std.stdio;
void main() {
 string[][] m1 = [[A', B']];
 writeln(m1);
 string[][] m2 = m1 ~ [[]];
 writeln(m2);
}

Bye,
bearophile


I do not think that this is very sensible (array-array appends are more 
natural than array-element appends, so disambiguation should go the 
other way). Is it documented anywhere or is it just an implementation 
artefact?

Array concat quiz

[bearophile]

A small quiz. This Python2 code:

m1 = [[A', B']]
print m1
m2 = m1 + [[]]
print m2


Prints:

[[A', B']]
[[A', B'], []]


What does this D2 program print?

import std.stdio;
void main() {
string[][] m1 = [[A', B']];
writeln(m1);
string[][] m2 = m1 ~ [[]];
writeln(m2);
}

Bye,
bearophile

Re: Array concat quiz

[Adam D. Ruppe]

Don't forget that string is an alias for immutable(char)[].

The immutable isn't important here, but the fact that
strings are arrays is.

char[][][] is the real type here.