Numeric functions (min, max, ceil) in Terraform - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the min() function do in Terraform?

The min() function returns the smallest number from a list of numbers provided.

beginner

How does the max() function behave in Terraform?

The max() function returns the largest number from a list of numbers provided.

beginner

Explain the purpose of the ceil() function in Terraform.

The ceil() function rounds a number up to the nearest whole number (integer).

beginner

What will min(3.7, 2.1, 5) return in Terraform?

It will return 2.1 because it is the smallest number among the inputs.

beginner

What is the result of ceil(4.2) in Terraform?

The result is 5 because ceil() rounds 4.2 up to the next whole number.

What does max(1, 4, 2) return in Terraform?

A 7

B 1

C 2

D 4

max() returns the largest number, which is 4 here.

Which function rounds a number up to the nearest integer?

A ceil()

B max()

C min()

D floor()

ceil() rounds numbers up to the nearest whole number.

What will min(10, 20, 5) output?

A 10

B 5

C 20

D 15

min() returns the smallest number, which is 5.

If you want the largest number from a list, which function do you use?

A min()

B ceil()

C max()

D round()

max() returns the largest number from the list.

What does ceil(7.0) return?

A 7

B 8

C 6

D 7.5

Since 7.0 is already a whole number, ceil() returns 7.

Describe how the min(), max(), and ceil() functions work in Terraform.

Think about picking smallest, largest, or rounding up numbers.

Give an example of when you might use the ceil() function in cloud infrastructure configuration.

Consider situations where partial resources don't make sense.

Practice

1. What does the Terraform function min(3, 7, 2) return?

easy

A. Error

B. 3

C. 7

D. 2

Solution

1. Step 1: Understand the min function

   The min function returns the smallest number from the given list.

2. Step 2: Compare the numbers 3, 7, and 2

   Among 3, 7, and 2, the smallest number is 2.

3. Final Answer:

   2 -> Option D

4. Quick Check:

   min(3,7,2) = 2 [OK]

Hint: min returns the smallest number from the list [OK]

Common Mistakes:

• Confusing min with max
• Expecting average instead of minimum
• Using ceil instead of min

2. Which of the following is the correct syntax to use the ceil function in Terraform?

easy

A. ceil(4.3)

B. ceil 4.3

C. ceil[4.3]

D. ceil{4.3}

Solution

1. Step 1: Recall Terraform function syntax

   Terraform functions use parentheses to enclose arguments, like function_name(argument).

2. Step 2: Check each option

   Only ceil(4.3) uses correct function call syntax.

3. Final Answer:

   ceil(4.3) -> Option A

4. Quick Check:

   Function calls use parentheses [OK]

Hint: Terraform functions always use parentheses for arguments [OK]

Common Mistakes:

• Using spaces instead of parentheses
• Using brackets or braces instead of parentheses
• Missing parentheses

3. What is the output of this Terraform expression?
max(5, ceil(3.2), min(4, 2))

medium

A. 2

B. 5

C. 3

D. 4

Solution

1. Step 1: Evaluate inner functions

   ceil(3.2) rounds 3.2 up to 4.
   min(4, 2) returns 2.

2. Step 2: Evaluate max function

   Now the expression is max(5, 4, 2). The largest number is 5.

3. Final Answer:

   5 -> Option B

4. Quick Check:

   max(5,4,2) = 5 [OK]

Hint: Evaluate inner functions first, then apply max [OK]

Common Mistakes:

• Ignoring nested function calls
• Mixing up min and max
• Forgetting ceil rounds up

4. Identify the error in this Terraform expression:
ceil(5.7, 2)

medium

A. Invalid function name

B. Missing parentheses

C. Too many arguments for ceil function

D. ceil cannot be used with decimals

Solution

1. Step 1: Check the ceil function signature

   The ceil function takes exactly one argument, a decimal number.

2. Step 2: Analyze the given expression

   The expression ceil(5.7, 2) has two arguments, which is invalid.

3. Final Answer:

   Too many arguments for ceil function -> Option C

4. Quick Check:

   ceil expects one argument [OK]

Hint: ceil takes only one decimal argument [OK]

Common Mistakes:

• Passing multiple arguments
• Confusing ceil with round
• Using wrong argument types

5. You want to find the smallest whole number greater than or equal to the minimum of 3.4, 2.1, and 5.9 in Terraform. Which expression achieves this?

hard

A. ceil(min(3.4, 2.1, 5.9))

B. min(ceil(3.4, 2.1, 5.9))

C. max(min(3.4, 2.1, 5.9))

D. ceil(max(3.4, 2.1, 5.9))

Solution

1. Step 1: Find the minimum of the numbers

   min(3.4, 2.1, 5.9) returns 2.1, the smallest number.

2. Step 2: Apply ceil to round up to the nearest whole number

   ceil(2.1) rounds 2.1 up to 3.

3. Final Answer:

   ceil(min(3.4, 2.1, 5.9)) -> Option A

4. Quick Check:

   min=2.1, ceil(2.1)=3 [OK]

Hint: Apply min first, then ceil to round up [OK]

Common Mistakes:

• Applying ceil before min
• Using max instead of min
• Confusing order of functions