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(`a`b!0 1)`b
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If <code>y</code> is an atom not in the domain of <code>x</code>, at returns the [[null?|null value]] for <code>x</code>'s type (except in kona).
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Latest revision as of 07:59, 9 July 2022
At
x@y
at is a primitive that unifies list indexing, function application, and dictionary lookup into a single concept. Syntactically, it can be expressed in three equivalent ways: x@y
(using @
as a verb), x y
(juxtaposition of nouns), and x[y]
(M-expression).
"abc"[1] "b" {1+2*x}@3 7 (`a`b!0 1)`b 1
If y
is an atom not in the domain of x
, at returns the null value for x
's type (except in kona).