Question

Well let’s say i have a foreach loop which look likes below

items = ['red', 'orange', 'yellow', 'green', 'red', 'yellow']
foreach var item in items:
    print(item)

is there any way to show repeated items once?

Answer 1

Use LINQ’s Distinct extension:

foreach(var item in items.Distinct()) {
    Console.WriteLine(item);
}

And just in case you actually mean Python:

distinct = list(set(items))
distinct.sort(lambda a, b: items.index(a) - items.index(b))

for item in distinct:
    print(item)