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ionutbarna's avatar
ionutbarna
New Contributor II
3 years ago

Number is equal ""(empty string)?

Hi there,

Can someone explain to me why the following expression generates true as a result:
I have the following pipeline:

In JSON Generator I have:

{
  "field": null
}

AutoPrep config:

Data type is set to a number; if null, 0 (zero) will be the result value.

Mapper:

Shouldn’t this validate as false? The field is a number and has the value 0.

The result after validation:

expression_language
pipeline

1 Reply

  • achoudhary's avatar
    achoudhary
    Employee
    3 years ago

    Hi ionutbarna,

    The SnapLogic Expression’s == works the same as == in a JavaScript,

    For the expression 0 == "", the left operand is a Number and the right is a String.

    In this case, the right operand is coerced to the type Number: 0 == Number("").

    This results in 0 == 0 and thus true.

    Here is the output from the same expression in JavaScript console: