Boolean expressions

Literal

Creates a new boolean value.

true

false

Comparison

Compares two values with one of the following operators.

Both values must be of the same type. Otherwise, the result is null.

Operator	Description	Supported types
=	equal to	any
!=	not equal to	any
<	less than	number, date, time, date-time, duration
<=	less than or equal to	number, date, time, date-time, duration
>	greater than	number, date, time, date-time, duration
>=	greater than or equal	number, date, time, date-time, duration
between [x] and [y]	same as (_ >= x and _ <= y)	number, date, time, date-time, duration

5 = 5
// true

5 != 5
// false

date("2020-04-05") < date("2020-04-06")
// true

time("08:00:00") <= time("08:00:00")
// true

duration("P1D") > duration("P5D")
// false

duration("P1Y") >= duration("P6M")
// true

5 between 3 and 7
// true

date("2020-04-06") between date("2020-04-05") and date("2020-04-09")
// true

Be Careful!

The equals operator has only one equals sign (e.g. x = y). In other languages, the operator has two equals signs (e.g. x == y).

Null check

Any value or variable can be compared with null to check if it is equal to null, or if it exists.

Comparing null to a value different from null results in false. It returns true if the value is null or the variable doesn't exist.

Comparing a context entry with null results in true if the value of the entry is null or if the context doesn't contain an entry with this key.

null = null
// true

"foo" = null
// false

{x: null}.x = null
// true

{}.y = null
// true

Conjunction/and

Combines multiple boolean values following the ternary logic.

• The result is true if all values are true.
• The result is false if one value is false.
• Otherwise, the result is null (i.e. if a value is not a boolean.)

true and true
// true

true and false
// false

true and null
// null

true and "otherwise"
// null

false and null
// false

false and "otherwise"
// false

Disjunction/or

Combines multiple boolean values following the ternary logic.

• The result is true if at least one value is true.
• The result is false if all values are false.
• Otherwise, the result is null (i.e. if a value is not a boolean.)

true or false
// true

false or false
// false

true or null
// true

true or "otherwise"
// true

false or null
// null

false or "otherwise"
// null

Instance of

Checks if the value is of the given type. Available type names:

• boolean
• number
• string
• date
• time
• date and time
• days and time duration
• years and months duration
• list
• context
• function
• Any

Use the type Any to check if the value is not null.

1 instance of number
// true

1 instance of string
// false

1 instance of Any
// true

null instance of Any
// false

duration("P3M") instance of years and months duration
// true

duration("PT4H") instance of days and time duration
// true

Unary-tests/in

Evaluates a unary-tests with the given value. The keyword in separates the value from the unary-tests.

5 in (3..7)
// true

date("2021-06-04") in [date("2021-05-01")..date("2021-05-31")]
// false

5 in (3,5,7)
// true

5 in [2,4,6,8]
// false