Returns true if map contains value under key, using comparer function. Use hasAnyValue if you don't care what key value might be under.
value
key
comparer
Having a comparer function is useful to check by value rather than object reference.
Map to search
Key to search
Value to search
Function to determine match. By default uses === comparison.
True if key is found
hasKeyValue(map,`hello`, `samantha`, (a, b) => a === b); Copy
hasKeyValue(map,`hello`, `samantha`, (a, b) => a === b);
Returns true if map contains
valueunderkey, usingcomparerfunction. Use hasAnyValue if you don't care what key value might be under.Having a comparer function is useful to check by value rather than object reference.