SDE - 2

Iniitaly created a map like {"(":")","{":"}","[":}]"} etc
iterated over the supplied array and created a hash of each item.
iterated over the hash created to find if the brackets are balanced

Used hooks,
Used axios to fetch the data
render the list in ul li using map.
Add a button name 'Sort' and attach an event listener to it.
OnClick of Sort button sort the array and update the variable which will re-render and sort the list.

iterated over the array and execute the callback on each item.
handle the iniial value like if iniital value is present it should be the first item of your array

Asked to explain closure with an example where i explained by creating a timer.
Asked about classical inheriance where i explained by creating two classes and the second class inheriting using super();
Asked about callback and promise difference which i explained.

Tip 1:Mentioned code splitting, useMemo,useCallback, preventing re-render.
Tip 2:Learn about webpack configurations,loader and plugins, split chunks etc