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Boolean Parser

Function parsing strings to booleans

Evaluation

This expression evaluates to a function of the form:

(string x) -> boolean

The function is consistent with parser semantics used for string to data conversion, for example by the CSV Input step.

Processing

String x is converted into a boolean by comparing it to values representing true, false and nil values. Any other string values can map to nil or throw an error.

If x is nil, nil is returned.

Settings

Name Type Description
True Values
 list

A list of strings representing true values.

If x is equal to any of them, the result is true.
False Values
 list

A list of strings representing false values.

If x is equal to any of them, the result is false.
Nil Values
 list

A list of strings representing nil values.

If x is equal to any of them, the result is nil.
Other Values
 string

Specifies behaviour when x does not match any values representing true, false, or nil.

  • nil - the resulting value is nil
  • error -> an error is thrown
Case Sensitive
 boolean

Determines how x compares as equal to other values

  • if checked, x compares as equal if identical to compared value
  • if unchecked, x compares as equal if differing in case only, i.e. "True" compares as equal to "true"
Trim
 boolean

If checked, any whitespace from both ends of x is trimmed before comparison.

If unchecked, x is compared unaltered.
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