Boolean Functions

is(value) | if(value)

Returns the boolean equivalent of the argument, so is(1 == 1) returns true and is(1 == 0) returns false.

When passed a variable or a non-boolean argument, it checks if the argument has a non-false value, so:

• is(5) return true while is(0) returns false.
• is("contents") return true while is("") returns false.
• is(person) return true if the person was any object and false if the person was null or undefined.

set roomReady = is(roomClean AND roomEmpty)
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not(value)

Returns the inverse of the argument, so not(true) returns false and not(false) returns true.

When passed a variable or a non-boolean argument, the behaviour is the inverse of is or if.

set isAdult = not(isMinor)
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every(array, item : predicate)

Returns true when every array item satisfies the lambda condition.

if every(Person.family, member : member.age >= 18) then Person.allAdults = true
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any(array, item : predicate) | some(array, item: predicate)

Returns true when at least one item satisfies the lambda condition.

if any(Person.family, member : member.age < 18) then Person.hasMinor = true
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N.B. See similar Array Functions.