I want to make a nested array and flatten it at run-time like this.

auto nestedArray = [1, 2, [3, 4], 5];

auto flattenedArray = myFun(nestedArray);

writeln(flattenedArray);   // => [1, 2, 3, 4, 5]


How can I do this in D?

Please help me out!

On 3/7/19 8:00 PM, Philos Kim wrote:
> I want to make a nested array and flatten it at run-time like this.
> 
> auto nestedArray = [1, 2, [3, 4], 5];
> 
> auto flattenedArray = myFun(nestedArray);
> 
> writeln(flattenedArray);   // => [1, 2, 3, 4, 5]
> 
> 
> How can I do this in D?
> 
> Please help me out!
> 

There are simpler ways, but looking at the below Rosetta Code link can be very instructive:

https://rosettacode.org/wiki/Flatten_a_list

On Fri, Mar 08, 2019 at 01:00:43AM +0000, Philos Kim via Digitalmars-d-learn wrote:
> I want to make a nested array and flatten it at run-time like this.
> 
> auto nestedArray = [1, 2, [3, 4], 5];

You can't write it this way because the nested array has a different type from the other elements. You have to write this as:

	auto nestedArray = [[1], [2], [3, 4], [5]];


> auto flattenedArray = myFun(nestedArray);

Use std.algorithm.iteration.joiner:

	flattenedArray = nestedArray.joiner.array;

Or simpler, use std.array.join:

	flattenedArray = nestedArray.join;


> writeln(flattenedArray);   // => [1, 2, 3, 4, 5]


T

-- 
People say I'm indecisive, but I'm not sure about that. -- YHL, CONLANG