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Help Center/ Data Lake Factory/ User Guide/ References/ EL/ Basic Operators

Basic Operators

Updated on 2022-02-22 GMT+08:00

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EL supports most of the arithmetic and logic operators provided by Java.

Operator List

**Table 1** Basic operators
Operator	Description
.	Accesses a Bean property or a mapping entry.
[]	Accesses an array or linked list.
()	Organizes a subexpression to change priority.
+	Plus sign
-	Minus or negative sign
*	Multiplication sign
/ or div	Division sign
% or mod	Modulo
== or eq	Test whether equal to.
!= or ne	Test whether unequal to.
< or lt	Test whether less than.
> or gt	Test whether greater than.
<= or le	Check whether less than or equal to.
>= or ge	Test whether greater than or equal to.
&& or and	Test logic and.
\|\| or or	Test logic or.
! or not	Test negation.
empty	Test whether empty.
?:	The expression is similar to if else. If the statement in front of ? is true, the value of the expression between ? and : is returned. Otherwise, the value following : is returned.

Example

If variable a is empty, default is returned. If variable a is not empty, a itself is returned. The expression is as follows:

#{empty a?"default":a}

Parent topic: EL

Previous topic: Expression Overview

Next topic: Date and Time Mode

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