Beside

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∘

Beside (∘), Compose or After is a primitive operator. It shares the glyph ∘ with Bind. Called dyadically with function operands f and g, it uses g monadically to pre-processes the right argument before applying f to the given left argument and pre-processed right argument. Called monadically with operands f and g, it applies f to the result of applying g to the argument.

In usage, X f∘g Y is equivalent to X f g Y, and f∘g Y is equivalent to f g Y. Thus, beside can be defined as the dop {⍺←⊢ ⋄ ⍺ ⍺⍺ ⍵⍵ ⍵}.

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APL built-ins [edit]
Primitive functions
Scalar
Monadic Conjugate ∙ Negate ∙ Signum ∙ Reciprocal ∙ Magnitude ∙ Exponential ∙ Natural Logarithm ∙ Floor ∙ Ceiling ∙ Factorial ∙ Not ∙ Pi Times ∙ Roll ∙ Type
Dyadic Add ∙ Subtract ∙ Times ∙ Divide ∙ Residue ∙ Power (function) ∙ Logarithm ∙ Minimum ∙ Maximum ∙ Binomial ∙ Comparison functions ∙ Boolean functions (And ∙ Or ∙ Nand ∙ Nor) ∙ Circle ∙ Complex
Non-Scalar
Structural Shape ∙ Reshape ∙ Tally ∙ Depth ∙ Ravel ∙ Enlist ∙ Table ∙ Catenate ∙ Reverse ∙ Rotate ∙ Transpose ∙ Raze ∙ Mix ∙ Split ∙ Enclose ∙ Nest ∙ Cut (K) ∙ Pair ∙ Partitioned Enclose ∙ Partition
Selection First ∙ Pick ∙ Take ∙ Drop ∙ Unique ∙ Identity ∙ Select ∙ Replicate ∙ Expand ∙ Set functions (Intersection ∙ Union ∙ Without) ∙ Bracket index ∙ Squad Indexing
Selector Index generator ∙ Grade Up ∙ Grade Down ∙ Index Of ∙ Interval Index ∙ Indices ∙ Deal
Computational Match ∙ Not Match ∙ Membership ∙ Find ∙ Nub Sieve ∙ Base ∙ Represent ∙ Matrix Inverse ∙ Matrix Divide ∙ Format ∙ Execute ∙ Materialise
Primitive operators Monadic Each ∙ Commute ∙ Constant ∙ Replicate ∙ Reduce ∙ Windowed Reduce ∙ Scan ∙ Outer Product ∙ Key ∙ I-beam ∙ Spawn ∙ Function axis
Dyadic Inner Product ∙ Power (operator) ∙ Rank (operator) ∙ Bind ∙ Beside ∙ Reverse Compose ∙ Atop ∙ Over ∙ At ∙ Variant ∙ Stencil
Quad names
Arrays Index origin ∙ Migration level
Functions
Operators
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