Funx.Predicate.Required (funx v0.8.4)

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Predicate that checks if a value is present (not nil and not empty string).

This predicate returns true for all values except:

  • nil
  • "" (empty string)

Note that falsy values like 0, false, and [] are considered present.

Options

None required.

Examples

use Funx.Predicate

alias Funx.Predicate.Required

# Check if name has a value
pred do
  check :name, Required
end

# Different from truthy - false and 0 pass
pred do
  check :enabled, Required  # false passes
  check :count, Required    # 0 passes
end