indexing - swift : I try to make searching window.. what is searching method? -

example index bar below image:

i want search word in array<string> code searching method word?

example:

 var = ["coffee","juice","water"] 

searchword "co"

searching method's result "cofee",

first need iterate on array , select elements match condition, there's filter method that. in case need check if word contains string, use containsstring.

a.filter { $0.containsstring("un") }