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?

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

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

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

What is the requirement for map indexes in index expressions?

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

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

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

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

<p>Whether the key is present in the map (B)</p> Signup and view all the answers

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