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Mastering Go's Index Expressions

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Questions and Answers

What types of data structures can index expressions access elements of?

Arrays, pointers to functions, slices, strings, and dictionaries.

Arrays, pointers to arrays, slices, strings, and dictionaries.

Arrays, pointers to functions, slices, strings, and maps.

Arrays, pointers to arrays, slices, strings, and maps. (correct)

What must the index be in an index expression?

A typed constant or an integer.

A non-negative constant.

An untyped constant or an integer. (correct)

A non-negative integer.

What happens when an out-of-range index is used in an index expression?

Silent failure

Undefined behavior

Compile-time error

Run-time panic (correct)

What happens when an out of range index is used in an index expression?

It causes a run-time panic (B) Signup and view all the answers

What happens when a map index is not present in the map?

It returns the zero value for the element type (C) Signup and view all the answers

What is the requirement for map indexes in index expressions?

Must be assignable to the key type of the map (A) Signup and view all the answers

What happens when you assign to an element of a nil map?

It causes a run-time panic (D) Signup and view all the answers

What is the additional boolean value that an index expression on a map yields?

Whether the key is present in the map (B) Signup and view all the answers

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