Comparison operations

Operations that compare values and return boolean results (0 or 1).

Overview

Equality

== (eq)

Outputs 1 if a equals b, 0 otherwise.

Signature: (a b -- bool)

5 5 == // 1
5 3 == // 0

!= (neq)

Outputs 1 if a does not equal b, 0 otherwise.

Signature: (a b -- bool)

5 3 != // 1
5 5 != // 0

Ordering

< (lt)

Outputs 1 if a is less than b, 0 otherwise.

Signature: (a b -- bool)

3 5 < // 1
5 3 < // 0

<= (lte)

Outputs 1 if a is less than or equal to b, 0 otherwise.

Signature: (a b -- bool)

5 5 <= // 1
3 5 <= // 1
6 5 <= // 0

> (gt)

Outputs 1 if a is greater than b, 0 otherwise.

Signature: (a b -- bool)

5 3 > // 1
3 5 > // 0

>= (gte)

Outputs 1 if a is greater than or equal to b, 0 otherwise.

Signature: (a b -- bool)

5 5 >= // 1
5 3 >= // 1
3 5 >= // 0

Range check

within

Outputs 1 if val is in [low, high), 0 otherwise.

Signature: (val low high -- bool)

5 0 10 within // 1 (5 is in [0,10))
10 0 10 within // 0 (10 is not in [0,10))

Word forms

Both symbol and word forms are available:

5 3 gt // Same as 5 3 >
5 5 eq // Same as 5 5 ==