String functions (join, split, format) in Terraform - Cheat Sheet & Quick Revision

Recall & Review

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What does the Terraform function join do?

The join function combines a list of strings into one string, using a specified separator between each element.

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How does the split function work in Terraform?

The split function breaks a single string into a list of strings, using a specified separator to decide where to split.

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Explain the purpose of the format function in Terraform.

The format function creates a formatted string by inserting values into placeholders inside a template string, similar to filling blanks in a sentence.

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Example: What is the result of join(",", ["apple", "banana", "cherry"])?

The result is the string "apple,banana,cherry", which joins the list elements with commas.

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Example: What does split(",", "red,green,blue") return?

It returns the list ["red", "green", "blue"] by splitting the string at each comma.

Which Terraform function would you use to combine a list of strings into one string?

A split

B join

C format

D concat

The join function combines list elements into a single string with a separator.

What does the split function return when given a string and a separator?

A A list of strings

B A number

C A single string

D A boolean

split breaks a string into a list of strings based on the separator.

How does the format function work in Terraform?

A It splits strings into lists

B It joins lists into strings

C It inserts values into a template string

D It converts strings to numbers

format creates a string by placing values into placeholders.

What is the output of join("-", ["a", "b", "c"])?

A "a,b,c"

B "abc"

C ["a", "b", "c"]

D "a-b-c"

The list elements are joined with dashes to form "a-b-c".

If you run split(":", "key:value"), what do you get?

A ["key", "value"]

B "key:value"

C "key"

D [":", "key", "value"]

The string is split at the colon into a list with two elements.

Describe how you would use Terraform string functions to convert a list of strings into a single comma-separated string.

Think about combining list items with a character between them.

Explain how the format function helps in creating dynamic strings in Terraform configurations.

Imagine writing a sentence where you fill in names or numbers dynamically.