flatten arrays

flatten_int_arrays.cs

var values = new[]
{
    new[] { 1, 2 },
    new[] { 2, 3 },
    new[] { 4, 5 },
};

var flattenedUniqueValues = values.SelectMany(x => x).Distinct();//technically it handles none int too

flatten_int_arrays.js

/*
 * there are so many ways to skin this cat, but here is a simple one
*/ 
const flattenJSON = array =>
    JSON.stringify(array)
    .match(/\d+/g)
    .map(x => parseInt(x));
//flattenJSON([1,2,[1,2]]);

flatten_int_arrays.ps1

$a = @(1, @(2, @(3)))
$a = $a | % {$_} | sort -unique #technically it handles none int too