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$boolean

Signature: $boolean(arg) Parameters:
  • arg - An argument to be cast to a Boolean.
Casts the argument to a Boolean using the following rules:

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$not

Signature: $not(arg) Parameters:
  • arg - An argument to be cast to a Boolean and inverted.
Returns Boolean NOT on the argument. arg is first cast to a boolean.

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$exists

Signature: $exists(arg) Parameters:
  • arg - An argument to chech the existence of.
Returns Boolean true if the arg expression evaluates to a value, or false if the expression does not match anything (e.g. a path to a non-existent field reference).