MCQs on Tables: The Core Data Structure | Lua
1. Introduction to Tables
- What is a table in Lua?
- a) A data structure used to store data
- b) A type of variable
- c) A function in Lua
- d) A type of loop
- Which symbol is used to define a table in Lua?
- a)
[] - b)
{} - c)
() - d)
||
- a)
- How do you create an empty table in Lua?
- a)
table = {} - b)
table = [] - c)
table = () - d)
table = ||
- a)
- What is the default index type for elements in a Lua table?
- a) Integer
- b) String
- c) Boolean
- d) Any type
- How do you add a key-value pair to a table in Lua?
- a)
table[key] = value - b)
table.key = value - c)
add(table, key, value) - d)
table.add(key, value)
- a)
- Can Lua tables hold different types of data in the same table?
- a) Yes, tables can store mixed data types
- b) No, tables can only store one type of data
- c) Yes, but only integers
- d) Yes, but only strings
- How do you initialize a table with multiple elements in Lua?
- a)
table = {1, 2, 3} - b)
table = [1, 2, 3] - c)
table = (1, 2, 3) - d)
table = {1; 2; 3}
- a)
- What happens if you try to access a table key that doesn’t exist?
- a) Lua throws an error
- b) Lua returns
nil - c) Lua returns
false - d) Lua creates the key with a default value
- Can you use tables to represent objects in Lua?
- a) Yes, tables are used as objects
- b) No, tables can only store data
- c) Yes, but only for arrays
- d) No, Lua doesn’t support objects
2. Indexing and Iterating Through Tables
- How do you access the value of a table element with a specific key?
- a)
table[key] - b)
table.get(key) - c)
table:key - d)
table.getValue(key)
- a)
- Which method is commonly used to iterate through all keys and values in a table?
- a)
forloop withpairs() - b)
forloop withnext() - c)
whileloop withpairs() - d)
repeat...untilloop withpairs()
- a)
- How can you iterate through the indices of an array-like table in Lua?
- a)
for i, v in ipairs(table) - b)
for i, v in pairs(table) - c)
for i = 1, table - d)
for i in table
- a)
- What is the function used to retrieve the next key-value pair in an iteration?
- a)
next() - b)
pairs() - c)
get() - d)
nextkey()
- a)
- What does the
ipairs()function iterate through?- a) Only the numerical indices of a table
- b) All keys in a table
- c) Only the string keys of a table
- d) None of the above
- What will the
pairs()function return when iterating over a table?- a) Key-value pairs
- b) Only the keys
- c) Only the values
- d) Table size
- Which of the following will correctly iterate through a table using a
forloop?- a)
for i, v in pairs(table) - b)
for i, v in ipairs(table) - c) Both of the above
- d) None of the above
- a)
- In Lua, what does the
next()function return?- a) The next key-value pair in a table
- b) The first key in a table
- c) A boolean value
- d) A string
- Can a table in Lua have both numerical indices and string keys?
- a) Yes, tables can have both
- b) No, a table can only have one type of key
- c) Yes, but only string keys
- d) Yes, but only numerical indices
- What is the output of iterating through a table with
for k, v in pairs(table)?- a) Key-value pairs
- b) Only the keys
- c) Only the values
- d) An error
3. Using Tables as Arrays
- How do you use a table in Lua as an array?
- a) By using consecutive integer indices
- b) By using string indices
- c) By using the
arraykeyword - d) By defining a table inside another table
- What happens when you assign an array element in Lua without using indices?
- a) It creates a new key-value pair
- b) It causes an error
- c) It creates a new index
- d) It overwrites the entire table
- How do you remove an element from a table when using it as an array?
- a)
table.remove() - b)
table.delete() - c)
table.clear() - d)
table.pop()
- a)
- Which function can be used to get the length of a table when used as an array?
- a)
#table - b)
table.length() - c)
table.size() - d)
table.count()
- a)
- What happens if you try to access an array element with an index beyond the table’s length in Lua?
- a) Lua returns
nil - b) Lua throws an error
- c) Lua returns
false - d) Lua creates a new index
- a) Lua returns
- How do you iterate through a table used as an array?
- a)
for i = 1, #table do - b)
for i, v in ipairs(table) - c)
for i, v in pairs(table) - d) Both a and b
- a)
- How do you initialize an empty array in Lua?
- a)
table = {} - b)
array = [] - c)
array = () - d)
array = ||
- a)
- What is the default index of the first element when using a table as an array in Lua?
- a) 0
- b) 1
- c) -1
- d)
nil
- How do you insert an element at the beginning of a table used as an array?
- a)
table.insert(table, 1, value) - b)
table.add(1, value) - c)
table.unshift(value) - d)
table.push(1, value)
- a)
- Can a Lua table be resized when used as an array?
- a) Yes, tables are dynamic
- b) No, tables have fixed size
- c) Only when using
arraytype - d) No, only arrays in C can be resized
- How do you find the index of an element in a Lua array?
- a)
table.indexOf(value) - b)
table.find(value) - c)
table.index(value) - d) Lua does not provide a built-in function for this
- a)
Answer Key
| Qno | Answer |
|---|---|
| 1 | a) A data structure used to store data |
| 2 | b) {} |
| 3 | a) table = {} |
| 4 | a) Integer |
| 5 | a) table[key] = value |
| 6 | a) Yes, tables can store mixed data types |
| 7 | a) table = {1, 2, 3} |
| 8 | b) Lua returns nil |
| 9 | a) Yes, tables are used as objects |
| 10 | a) table[key] |
| 11 | a) for loop with pairs() |
| 12 | a) for i, v in ipairs(table) |
| 13 | a) next() |
| 14 | a) Only the numerical indices of a table |
| 15 | a) Key-value pairs |
| 16 | c) Both of the above |
| 17 | a) The next key-value pair in a table |
| 18 | a) Yes, tables can have both |
| 19 | a) Key-value pairs |
| 20 | a) By using consecutive integer indices |
| 21 | a) It creates a new key-value pair |
| 22 | a) table.remove() |
| 23 | a) #table |
| 24 | a) Lua returns nil |
| 25 | d) Both a and b |
| 26 | a) table = {} |
| 27 | b) 1 |
| 28 | a) table.insert(table, 1, value) |
| 29 | a) Yes, tables are dynamic |
| 30 | d) Lua does not provide a built-in function for this |