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")
Yes
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