keyset – Tarik Billa

java collections – keyset() vs entrySet() in map

August 23, 2023 by Tarik

Every call to the Iterator.next() moves the iterator to the next element. If you want to use the current element in more than one statement or expression, you have to store it in a local variable. Or even better, why don’t you simply use a for-each loop? for (String key : map.keySet()) { System.out.println(key + … Read more

lua: retrieve list of keys in a table

April 29, 2023 by Tarik

local keyset={} local n=0 for k,v in pairs(tab) do n=n+1 keyset[n]=k end Note that you cannot guarantee any order in keyset. If you want the keys in sorted order, then sort keyset with table.sort(keyset).