Calls a rule or function that returns either true or false for each item in list, asks the question, "Do all items in this list yield true for this rule/function?", and returns true if all items in list evaluates to true.
all( predicate, list, [context, … ])
predicate: (Function, Rule, or Data Type Constructor) Expression that returns a Boolean (true or false).
list: (Any Type Array) List of elements that the predicate iterates through.
context: (Any Type Array) Variable number of parameters passed directly into each predicate evaluation.
Boolean
Use fn!functionName to reference an expression function and rule!ruleName to reference a rule.
Returns false as soon as the returned value of an evaluation yields false; otherwise, returns true.
Empty and null lists yield true.
Serves as an alternative to and(apply(rule!iseven, {-1,0,1,2})).
a!forEach() cannot be used within rules used in this function.
Given a function f(x), all(fn!f, {a, b, c}, v) returns and({f(a, v), f(b, v), f(c, v)}).
all(rule!iseven,{-1,0,1,2},1) returns false
