Answer the following statements true (T) or false (F)

Question

1) A hash table is one way to implement a dictionary.
2) The ?. operator determines whether an array or collection is null before accessing an
element of the array or collection.
3) A lambda expression begins with a parameter list and is followed by the => lambda operator
and an expression that represents the lambda’s body.
4) An expression lambda contains a statement block—one or more statements enclosed in
braces ({})—to the right of the lambda operator.
5) The parentheses surrounding a lambda’s parameter list are optional.
6) A key aspect of functional programming is immutability—not modifying the data
source being processed or any other program state, such as counter-control variables in
loops. This eliminates common errors that are caused by modifying data incorrectly.

Answer 1

1) True.
2) False. The ?[] determines whether an array or collection is null before accessing an
element of the array or collection.
3) True.
4) False. A statement lambda contains a statement block—one or more statements enclosed
in braces ({})—to the right of the lambda operator.
5) False. When specifying a lambda parameter’s type and/or when a lambda has more
than one parameter, you must enclose the parameter list in parentheses.
6) True