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Category: Special function


This function evaluates the text_expression argument as an EasyMorph expression.

Use cases

This function makes it possible to define EasyMorph expressions externally using parameters.


text_expressionTextAn expression in text format to be evaluated.

Return value type: Any (The type of the expression output)


The argument itself must not be an expression with a reference to a column.

In an expression, the eval() function is evaluated first (pre-evaluated) and only then the whole expression is evaluated for every row. Pre-evaluation can be recursive until the final expression doesn't contain the eval() function.


  eval('1+1')  //Returns 2
  eval('1' & '+1')  //Returns 2
  eval('max(1,2)')  //Returns 2
  eval('[Count]+1')  //Evaluated as [Count]+1
  eval([Count] & '+1')  //Invalid! Column references are not allowed in argument expressions.
  eval({Param1})  //Parameter references to expressions in text format are allowed.
  eval("1+" & "eval('1+1')")  //Returns 3  (Nesting eval() is allowed.)
syntax/functions/eval.txt · Last modified: 2023/05/16 15:02 by dmitry

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