->> Day-11 AWS Terraform Functions - Part 1

Source: Dev.to

lower

Converts all cased letters in the given string to lowercase. This function uses Unicode’s definition of letters and of upper‑ and lowercase.

lower("HELLO")
# => "hello"

replace

Searches a given string for a substring and replaces each occurrence with a replacement string.

replace("1 + 2 + 3", "+", "-")
# => "1 - 2 - 3"

replace("hello world", "/w.*d/", "everybody")
# => "hello everybody"

substr

Extracts a substring from a given string by offset and (maximum) length.

substr("hello world", 1, 4)
# => "ello"

split

Produces a list by dividing a given string at all occurrences of a separator.

split(",", "foo,bar,baz")
# => [
#   "foo",
#   "bar",
#   "baz",
# ]

split(",", "foo")
# => [
#   "foo",
# ]

split(",", "")
# => [
#   "",
# ]

merge

Takes an arbitrary number of maps or objects and returns a single map/object that contains a merged set of elements from all arguments. If the same key appears in multiple arguments, the later argument takes precedence.

merge({a = "b", c = "d"}, {e = "f", c = "z"})
# => {
#   "a" = "b"
#   "c" = "z"
#   "e" = "f"
# }

merge({a = "b"}, {a = [1, 2], c = "z"}, {d = 3})
# => {
#   "a" = [
#     1,
#     2,
#   ]
#   "c" = "z"
#   "d" = 3
# }

lookup

Retrieves the value of a single element from a map given its key. If the key does not exist, the provided default value is returned.

lookup({a = "ay", b = "bee"}, "a", "what?")
# => "ay"

lookup({a = "ay", b = "bee"}, "c", "what?")
# => "what?"