Why does this fail L is [1,2,3,4], and this works: L = [1,2,3]?
But L is 1, and L = 1 both work the same.
Why does this fail L is [1,2,3,4] , and this works: L = [1,2,3]
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Why does this fail L is [1,2,3,4], and this works: L = [1,2,3]?
But L is 1, and L = 1 both work the same.
isshould only be used when evaluating arithmetic operations on the right-hand side.i.e.:
is/2evaluates the right-hand structure as an arithmetic expression. If it is not a valid arithmetic expression or a number,is/2fails. Otherwise, the number to which the arithmetic expression evaluted is unified with the [presumably] unbound left-hand value.