~ Match

x~y    ~[x;y]

Returns 0b unless x and y are identical. Comparison tolerance is used when matching floats.

q)(1 2 3+4 5 6)~4 5 6+1 2 3   / the arguments are identical
1b
q)(1 2 3-4 5 6)~4 5 6-1 2 3   / these are not identical
0b
q)1 2 3 ~`a`b                 / any two data objects can be compared
0b

Match depends on the data type of the arguments, not just the values.

q)1~1h
0b
q)3~3.0
0b

This means the same symbols from different enumerations do not match, even when equal.

q)l1:`a`b`c
q)l2:`a`b`c
q)(`l1$`a)~`l2$`a
0b
q)(`l1$`a)=`l2$`a
1b

Match ignores attributes on lists.

q)1 2 3~`s#1 2 3
1b

Two tables match even if they differ in attributes.

q)t1:([]x:1 2 3)
q)t2:([]x:`s#1 2 3)
q)meta t1
c| t f a
-| -----
x| j
q)meta t2
c| t f a
-| -----
x| j   s
q)t1~t2
1b

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Equal =, Not Equal <>

Comparison

Q for Mortals: §4.2 Match