What’s the difference between UNION, MINUS, and INTERSECT?
They are all set operators.
But, UNION will combine the results from query1 with query2 and remove duplicate records.
MINUS will display the results of query1 and remove those that match any records from query2.

INTERSECT will display the records that appear in both query1 and query2.

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NAMED FUNCTION SYNTAX (DEFINITION AND EXECUTION

Parameterized function (named function)

Spread operator ( operations) default value for spread operator [empty array ]

Limitation of spread operator

We can only pass 1 spread operator in a function

Only one spread operator is allowed and that must be the last function ( or occurrence)

Default function
Undefined is weaker and can't replace original values
Null is stronger and can delete original values

Returning in JAVASCRIPT ES6

Function with parameters and return type .....

Function with parameters and return types ( login validation code )