Re: Setting a list of values

[Joel via Digitalmars-d-learn]

On Sunday, 1 May 2016 at 05:42:00 UTC, Ali Çehreli wrote:

On 04/30/2016 10:05 PM, Joel wrote:
> This has no effect:
> _bars.each!(a => { a._plots.fillColor = Color(255, 180, 0);
});

This is a common issue especially for people who know lambdas from other languages. :)

Your lambda does not do any work. Rather, your lambda returns another lambda, which is promptly ignored:

import std.stdio;
import std.algorithm;

void main() {
    auto arr = [ 1, 2 ];

arr.each!(a => { writeln(a); }); // returns lambda for each a

}

The lambda that 'each' takes above is "given a, produce this lambda". . To do the intended work, you need to remove the curly braces (and the semicolon):

    arr.each!(a => writeln(a));

Or, you could insert empty () to call the returned lambda but that would completely be extra work in this case:

    arr.each!(a => { writeln(a); }());

Ali

This seems to work the best:

arr.each!(a => { writeln(a); }());