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Boolean All

rascal-0.40.17

Synopsis​

All argument expressions are true.

Syntax​

all ( Exp₁, Exp₂, ... )

Types​

//

Exp₁Exp₂...all ( Exp₁, Exp₂, ... )
boolbool...bool

Description​

Yields true when all combinations of values of Expᵢ are true.

Examples​

Are all integers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 even?

rascal>all(int n <- [1 .. 10], n % 2 == 0);
bool: false

Are all integers 0, 2, 4, 6, 8, 10 even?

rascal>all(int n <- [0, 2 .. 10], n % 2 == 0);
bool: true

When one of the Expᵢ enumerates the elements of an empty list, all always returns true:

rascal>all(int n <- [], n > 0);
bool: false

Pitfalls​

WARNING: The Rascal interpreter and compiler give different results on an empty list. The interpreter returns fals for the abo eexample.