EQUALP thing1 thing2
EQUAL? thing1 thing2
thing1 = thing2

Outputs TRUE if both inputs are equal, FALSE otherwise.

Two numbers are equal if they have the same numeric value. Two non-numeric words are equal if they contain the same characters in the same order. If there is a variable named CASEIGNOREDP whose value is TRUE, then an upper case letter is considered the same as the corresponding lower case letter. (This is the case by default.) Two lists are equal if their members are equal. An array is only equal to itself; two separately created arrays are never equal even if their elements are equal. (It is important to be able to know if two expressions have the same array as their value because arrays are mutable; if, for example, two variables have the same array as their values then performing SETITEM on one of them will also change the other.)

SHOW EQUALP 1 1
true

SHOW EQUALP 1 2
false

SHOW EQUALP [1 2 3] [1 2 3]
true

SHOW EQUALP [1 2 3] [3 2 1]
false

SHOW EQUALP {1 2 3} {1 2 3}
false

MAKE "myarray {1 2 3}
SHOW EQUALP :myarray :myarray
true