MCQs on Advanced Table Manipulation | Lua
1. Nested Tables
- What is a nested table in Lua?
- a) A table that contains another table as its element
- b) A table that stores multiple values
- c) A table with only numerical indices
- d) A function that returns a table
- How do you access an element of a nested table in Lua?
- a)
table[key][subkey] - b)
table.subkey[key] - c)
table[key] - d)
table.get(subkey)
- a)
- Can you have tables within tables in Lua?
- a) Yes, tables can contain other tables
- b) No, Lua does not allow nested tables
- c) Yes, but only one level deep
- d) No, only arrays are allowed
- How do you store a table inside another table in Lua?
- a)
table1 = {table2} - b)
table1 = table2 - c)
table1 = table2[0] - d)
table1 = table2()
- a)
- What is the output of accessing a nested table element like
table[1][2]?- a) The value at the first index of the first table and the second index of the second table
- b) A syntax error
- c) The second element of the first table
- d) The first element of the second table
- How can you modify an element of a nested table in Lua?
- a)
table[1][2] = value - b)
table[1] = value[2] - c)
table[2][1] = value - d)
table[1][2].value = value
- a)
- Is it possible to have tables as values and keys in Lua tables?
- a) Yes, Lua supports tables as both keys and values
- b) No, only strings and numbers can be keys
- c) Yes, but only when the keys are strings
- d) No, tables can only be values
- Can you have a table as a key to another table in Lua?
- a) Yes, but only if the table is a string
- b) Yes, Lua tables can have other tables as keys
- c) No, tables cannot be used as keys
- d) Yes, only if the table is mutable
- What is the behavior of
table[1][1]when the first table is empty?- a) Returns
nil - b) Throws an error
- c) Creates a new table
- d) Returns an empty string
- a) Returns
- Can you iterate over a nested table using the
forloop in Lua?- a) Yes, using nested
forloops - b) No,
forloops do not support nested tables - c) Yes, using the
pairs()function only - d) No, you must manually access each element
- a) Yes, using nested
2. Using Table Library Functions
- Which function is used to add an element to the end of a table in Lua?
- a)
table.insert() - b)
table.push() - c)
table.add() - d)
table.append()
- a)
- How do you remove an element from a table in Lua?
- a)
table.remove() - b)
table.delete() - c)
table.pop() - d)
table.drop()
- a)
- What is the result of using
table.sort()in Lua?- a) Sorts the elements of the table in ascending order
- b) Sorts the keys of the table
- c) Removes duplicate elements
- d) Reverses the table
- What is the purpose of
table.concat()in Lua?- a) Joins elements of a table into a single string
- b) Sorts elements of a table
- c) Adds elements to a table
- d) Removes elements from a table
- How can you find the length of a table in Lua?
- a)
#table - b)
table.length() - c)
table.size() - d)
table.count()
- a)
- Which of the following is used to insert a value at the beginning of a table in Lua?
- a)
table.insert(table, 1, value) - b)
table.push(value) - c)
table.addFirst(value) - d)
table.unshift(value)
- a)
- What happens if you try to remove an element from an empty table using
table.remove()?- a) Returns
nil - b) Throws an error
- c) Does nothing
- d) Creates a new element
- a) Returns
- What does
table.sort()do when passed a custom comparison function?- a) Sorts the table using the custom function’s logic
- b) Ignores the function and sorts normally
- c) Sorts the table in reverse order
- d) Throws an error
- Which function in Lua can combine the elements of a table into a string with a delimiter?
- a)
table.concat() - b)
table.join() - c)
table.merge() - d)
table.mergeBy()
- a)
- How do you clear all elements from a table in Lua?
- a)
table.clear() - b)
table.removeAll() - c)
table = {} - d)
table.empty()
- a)
3. Key-Value Pairs
- What is the basic structure of a key-value pair in a Lua table?
- a)
key = value - b)
value = key - c)
key -> value - d)
value -> key
- a)
- How can you access the value of a specific key in a Lua table?
- a)
table[key] - b)
table.getValue(key) - c)
table:retrieve(key) - d)
table.access(key)
- a)
- What happens if you try to access a non-existent key in a Lua table?
- a) Returns
nil - b) Returns
false - c) Throws an error
- d) Returns
0
- a) Returns
- Can you change the value associated with a key in a Lua table?
- a) Yes, by assigning a new value to the key
- b) No, once a key is created, its value cannot be changed
- c) Yes, but only if the key is a number
- d) Yes, but only if the value is a string
- Which function is used to get all the keys of a table in Lua?
- a)
table.keys() - b)
pairs() - c)
table.getKeys() - d)
table.indexes()
- a)
- What is the default value returned if you try to access an undefined key in a Lua table?
- a)
nil - b)
false - c)
0 - d)
undefined
- a)
- Can a Lua table have multiple keys pointing to the same value?
- a) Yes, tables can have duplicate keys
- b) No, each key must be unique
- c) Yes, but only if the values are numbers
- d) No, keys are automatically unique
- How do you check if a key exists in a Lua table?
- a)
if table[key] then - b)
if key in table then - c)
if table.has(key) - d)
if table.contains(key)
- a)
- Can you use
table.insert()to add a key-value pair to a table?- a) No,
table.insert()is for arrays only - b) Yes, but only if the value is a number
- c) Yes,
table.insert()can insert key-value pairs - d) No, use
table.add()instead
- a) No,
- How do you remove a specific key-value pair from a table in Lua?
- a)
table[key] = nil - b)
table.remove(key) - c)
table.delete(key) - d)
table.removeValue(key)
- a)
Answer Key
| Qno | Answer |
|---|---|
| 1 | a) A table that contains another table as its element |
| 2 | a) table[key][subkey] |
| 3 | a) Yes, tables can contain other tables |
| 4 | a) table1 = {table2} |
| 5 | a) The value at the first index of the first table and the second index of the second table |
| 6 | a) table[1][2] = value |
| 7 | a) Yes, Lua supports tables as both keys and values |
| 8 | b) Yes, Lua tables can have other tables as keys |
| 9 | a) Returns nil |
| 10 | a) Yes, using nested for loops |
| 11 | a) table.insert() |
| 12 | a) table.remove() |
| 13 | a) Sorts the elements of the table in ascending order |
| 14 | a) Joins elements of a table into a single string |
| 15 | a) #table |
| 16 | a) table.insert(table, 1, value) |
| 17 | a) Returns nil |
| 18 | a) Sorts the table using the custom function’s logic |
| 19 | a) table.concat() |
| 20 | c) table = {} |
| 21 | a) key = value |
| 22 | a) table[key] |
| 23 | a) Returns nil |
| 24 | a) Yes, by assigning a new value to the key |
| 25 | b) pairs() |
| 26 | a) nil |
| 27 | a) Yes, tables can have duplicate keys |
| 28 | a) if table[key] then |
| 29 | a) No, table.insert() is for arrays only |
| 30 | a) table[key] = nil |