< Less Than
<= Up To

x<y    <[x;y]
x<=y   <=[x;y]

Returns 1b where the underlying value of x is less than (or up to) that of y.

q)(3;"a")<(2 3 4;"abc")
001b
000b
q)(3;"a")<=(2 3 4;"abc")
011b
111b

With booleans:

q)0 1 </:\: 0 1
01b
00b
q)0 1 <=/:\: 0 1
11b
01b

Implicit iteration

Less Than and Up To are atomic functions.

q)(10;20 30)<(50 -20;5)
10b
00b

They apply to dictionaries and tables.

q)k:`k xkey update k:`abc`def`ghi from t:flip d:`a`b!(10 -21 3;4 5 -6)

q)d<=5
a| 011b
b| 111b

q)t<5
a b
---
0 1
1 0
1 1

q)k<5
k  | a b
---| ---
abc| 0 1
def| 1 0
ghi| 1 1

Range and domain

    b g x h i j e f c s p m d z n u v t
----------------------------------------
b | b . b b b b b b b . b b b b b b b b
g | . b . . . . . . . . . . . . . . . .
x | b . b b b b b b b . b b b b b b b b
h | b . b b b b b b b . b b b b b b b b
i | b . b b b b b b b . b b b b b b b b
j | b . b b b b b b b . b b b b b b b b
e | b . b b b b b b b . b b b b b b b b
f | b . b b b b b b b . b b b b b b b b
c | b . b b b b b b b . b b b b b b b b
s | . . . . . . . . . b . . . . . . . .
p | b . b b b b b b b . b b b b b b b b
m | b . b b b b b b b . b b b . . . . .
d | b . b b b b b b b . b b b b . . . .
z | b . b b b b b b b . b . b b b b b b
n | b . b b b b b b b . b . . b b b b b
u | b . b b b b b b b . b . . b b b b b
v | b . b b b b b b b . b . . b b b b b
t | b . b b b b b b b . b . . b b b b b

Range: b

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Greater Than, At Least
Comparison