Boolean Functions

Boolean Functions

Boolean functions

$boolean()

Signature: $boolean(arg)

Casts the argument to a Boolean using the following rules:

| Argument type | Result |

| ------------- | ------ |

| Boolean | unchanged |

| string: empty | false|

| string: non-empty | true |

| number: 0 | false|

| number: non-zero | true |

| null | false|

| array: empty | false |

| array: contains a member that casts to true | true |

| array: all members cast to false | false |

| object: empty | false |

| object: non-empty | true |

| function | false |

$not()

Signature: $not(arg)

Returns Boolean NOT on the argument. arg is first cast to a boolean

$exists()

Signature: $exists(arg)

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).


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