# Operators operators

There are two kinds of operators: unary operators and binary operators. There are left-hand unary operators and right-hand unary operators.

``````// left-hand unary operators
// <operator> <operand>
// operand is an expression

// right-hand unary operators
// <operator> <operand>
// operand is an expression
@event{LobbyBeacon.endUserIDs._experience.emailid.id} is not null

// binary operators
// <operand1> <operator> <operand2>
// operand is an expression
``````

## Important notes important-notes

• When using a multiplication (`*`), both operation fields must have the same type, either integer or decimal. Example :

• the following example is correct: `3.0 * 4.0`
• `3 * 4.0` will lead to an error

## Logical logical

### and

``````<expression1> and <expression2>
``````

Both <expression1> and <expression2> must be boolean. The result is boolean.

Example:

``````3.14 > 2 and 3.15 < 1
``````

### or

``````<expression1> or <expression2>
``````

Both <expression1> and <expression2> must be boolean. The result is boolean.

Example:

``````3.14 > 2 or 3.15 < 1
``````

### not

``````not <expression>
``````

<expression> must be boolean. The result is boolean.

Example:

``````not 3.15 < 1
``````

## Comparison comparison

### is null

``````<expression> is null
``````

The result is boolean.

Note that null means the expression has no evaluated value.

Example:

``````@event{BarBeacon.location} is null
``````

### is not null

``````<expression> is not null
``````

The result is boolean.

Note that null means the expression has no evaluated value.

Example:

``````@event{BarBeacon.location} is not null
``````

### has null

``````<expression> has null
``````

<expression> must be a list. The result is boolean.

Useful to identify that a list contains at least one null value.

Example:

``````["foo", "bar", null] has null
``````

Returns true

``````["foo", "bar", ""] has null
``````

Returns false because “” is not considered as null.

### ==

``````<expression1> == <expression2>
``````
NOTE
For <expression1> and <expression2> there is no data type control.

Example:

``````3.14 == 42
``````
``````"foo" == "bar"
``````

### !=

``````<expression1> != <expression2>
``````
NOTE
For <expression1> and <expression2> there is no data type control.

The result is boolean.

Example:

``````3.14 != 42
``````
``````"foo" != "bar"
``````

### >

``````<expression1> > <expression2>
``````

Datetime can be compared with Datetime.

Datetimeonly can be compared with Datetimeonly.

Both integer or decimal can be compared with both integer or decimal.

Any other combination is forbidden.

The result is boolean.

Example:

``````3.14 > 42
``````

### >=

``````<expression1> >= <expression2>
``````

Datetime can be compared with Datetime.

Datetimeonly can be compared with Datetimeonly.

Both integer or decimal can be compared with both integer or decimal.

Any other combination is forbidden.

The result is boolean.

Example:

``````42 >= 3.14
``````

### <

``````<expression1> < <expression2>
``````

Datetime can be compared with Datetime.

Datetimeonly can be compared with Datetimeonly.

Both integer or decimal can be compared with both integer or decimal.

Any other combination is forbidden.

The result is boolean.

Example:

``````42 < 3.14
``````

### <=

``````<expression1> <= <expression2>
``````

Datetime can be compared with Datetime.

Datetimeonly can be compared with Datetimeonly.

Both integer or decimal can be compared with both integer or decimal.

Any other combination is forbidden.

The result is boolean.

Example:

``````42 <= 3.14
``````

## Arithmetic arithmetic

### +

``````<expression1> + <expression2>
``````

Both expressions must be numeric (integer or decimal).

The result is also numeric.

Example:

``````1 + 2
``````

Returns 3

### -

``````<expression1> - <expression2>
``````

Both expressions must be numeric (integer or decimal).

The result is also numeric.

Example:

``````2 - 1
``````

Returns 1

### /

``````<expression1> / <expression2>
``````

Both expressions must be numeric (integer or decimal).

The result is also numeric.

<expression2> must not be equal to 0 (returns 0).

Example:

``````4 / 2
``````

Returns 2

### *

``````<expression1> * <expression2>
``````

Both expressions must be numeric (integer or decimal).

The result is also numeric.

Example:

``````3 * 4
``````

Returns 12

### %

``````<expression1> % <expression2>
``````

Both expressions must be numeric (integer or decimal).

The result is also numeric.

Example:

``````3 % 2
``````

Returns 1.

## Math math

### is numeric

``````<expression> is numeric
``````

The type of the expression is integer or decimal.

Example:

``````@ is numeric
``````

### is integer

``````<expression> is integer
``````

The type of the expression is integer.

Example:

``````@ is integer
``````

### is decimal

``````<expression> is decimal
``````

The type of the expression is decimal.

Example:

``````@ is decimal
``````

## String string

### +

``````<string> + <expression>
``````
``````<expression> + <string>
``````

It concatenates two expressions.

One expression must be a chained string.

Example:

``````"the current time is " + (now())
``````

Returns “the current time is 2023-09-23T09:30:06.693Z”

``````(now()) + " is the current time"
``````

Returns “2023-09-23T09:30:06.693Z is the current time”

``````"a" + "b" + "c" + 1234
``````

Returns “abc1234”.

## Date date

### +

``````<expression> + <duration>
``````

Append a duration to a dateTime, a dateTimeOnly or a duration.

Example:

``````(toDateTime("2023-12-03T15:15:30Z")) + (toDuration("PT15M"))
``````

Returns a dateTime 2023-12-03T15:30:30Z

``````(toDateTimeOnly("2023-12-03T15:15:30")) + (toDuration("PT15M"))
``````

Returns a dateTimeOnly 2023-12-03T15:30:30

``````(now()) + (toDuration("PT1H"))
``````

Returns a dateTime (with UTC time zone) one hour later from current time

``````(toDuration("PT1H")) + (toDuration("PT1H"))
``````

Returns a duration PT2H

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