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--- syntax:operators [2016/06/08 21:11] – dmitry
+++ syntax:operators [2020/11/26 18:27] – dmitry
@@ Line 2: / Line 2: @@
 Here is list of operators that can be used in expressions in EasyMorph.
+=== Basic operators ===
 ^  Operator  ^ Description  ^ Result    ^
@@ Line 30: / Line 32: @@
   ([Amount] > 1000 and [Quantity] > 1) or [Quantity]>10
+=== The IF..THEN..ELSE operator ===
+This operator can be used to perform conditional calculations. It has the following syntax:
+IF //condition// THEN //expression// ELSE //expression//
+A shorter form where the ELSE expression is omitted and always returns an empty value, is also possible:
+IF //condition// THEN //expression//
+Note that unlike the [[syntax:functions:if|if()]] function, in the IF operator the "then" expression is only evaluated when the condition is TRUE. The "else" expression in this case is not evaluated (i.e. ignored). Vice verse, if the condition is FALSE, then the "then" expression is ignored, and only the "else" expression is evaluated.
+Examples:
+   IF [Amount] > 1000 THEN 'Large order' ELSE 'Small order'
+   IF [Year] = year(today()) THEN [Amount] ELSE 0
+   IF [Qty] = 0 THEN 0 ELSE [Amount] / [Qty]   // Doesn't fail when [Qty] = 0
+=== The LET operator ===
+The LET operator allows simplifying expressions by declaring repetitive parts as local constants which can later be used instead of the repetitive parts. The operator has the following syntax:
+LET //local_constant// = //expression//
+Once a local constant is declared, it can be used in the expression(s) that follow the declaration. Example:
+   LET d = day(today())
+   IF d=1 THEN 'First day' ELSE 'Day: ' & d