Coalesce returns the first non-empty arguments.

GetValueNotEmptyOrDefault return defaultValue if value is zeroValue, else return value.

Sum return sum of array number.

TernaryF is a 1 line if/else statement whose options are functions Play: https://go.dev/play/p/AO4VW20JoqM.

TernaryOp represent for e1 ? e2 : e3.