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DocumentationTencent Infrastructure Automation for TerraformUser GuideSyntax GuideExpression
Expression
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Last updated: 2024-12-02 16:01:33
Expression
Last updated: 2024-12-02 16:01:33
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Operators

Operators are used for arithmetic or logical operations.

Arithmetic operators

Operator
Description
a + b
Returns the result of adding a and b together.
a - b
Returns the result of subtracting b from a.
a * b
Returns the result of multiplying a and b.
a / b
Returns the result of dividing a by b.
a % b
Returns the remainder of dividing a by b. This operator is generally useful only when used with whole numbers.
-a
Returns the result of multiplying a by -1.


Comparison operators

Operator
Description
a == b
Returns true if a and b both have the same type and the same value, or false otherwise.
a != b
Contrary to ==.
a < b
Returns true if a is less than b, or false otherwise.
a > b
Returns true if a is greater than b, or false otherwise.
a <= b
Returns true if a is less than or equal to b, or false otherwise.
a >= b
Returns true if a is greater than or equal to b, or false otherwise.


Logical operators

Operator
Description
a || b
Returns true if either a or b is true, or false if both are false.
a && b
Returns true if both a and b are true, or false if either one is false.
!a
Returns true if a is false, or false if a is true.


Conditional Expression

A conditional expression uses the value of a Boolean expression to select one of two values. For example:
condition ? one_value : two_value

for Expression

A for expression can be used to traverse a set of collections and map one collection type to another. For example:
[for item in items : upper(item)]

Splat Expression

A splat expression provides a more concise way to express a common operation that could otherwise be performed with a for expression. For example:
[for o in var.list : o.id]
is equivalent to
var.list[*].id

Function Expression

Terraform supports the use of some built-in functions when expressions are calculated. An expression to call a function is similar to an operator. For example:
upper("123")

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