On 1/11/19 10:20 AM, Head Scratcher wrote:
I am just learning D. So far, I am impressed by its elegance and power.
I have an associative array bool[string]. I want to filter it by value
(!bool), then extract the keys and sort them. I am struggling with the
syntax and working with ranges. I can't find any documentation related
to filtering associative arrays.
This is what I currently have, but it doesn't compile:
auto sortedStrings = myAssocArray.byKeyValue.filter!((string k,value) =>
!value).assocArray.keys.sort();
import std.range;
import std.algorithm;
import std.array;
auto sortedStrings = myAssocArray
.byKeyValue
.filter!(kvp => !kvp.value) // kvp = key value pair
.map!(kvp => kvp.key) // map to the key strings
.array // form a sortable array
.sort; // sort it
Note the nice formatting to show how the range pipeline goes, and allows
for comments explaining each step.
-Steve
