Filter and sort associative array
schveiguy at gmail.com
Fri Jan 11 15:48:51 UTC 2019
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) =>
auto sortedStrings = myAssocArray
.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.
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