operators -- an overview

operators -- an overview

Here is a list of unary and binary operators in the language. Many of them can have methods installed for handling arguments of specific types.

-- function application

, -- separates elements of lists or sequences

; -- statement separator

= -- assignment

<- -- assignment with left hand side evaluated

-> -- make a function

:= -- assignment of method or new local variable

== -- equal

!= -- not equal

=== -- strictly equal

=!= -- strictly not equal

< -- less than

<= -- less than or equal

=> -- option

> -- greater than

>= -- greater than or equal

? -- comparison

or -- or

and -- and

not -- negation

.. -- sequence builder

+ -- addition

- -- subtraction

* -- multiplication

/ -- division, or applying a function to elements of a list

// -- quotient

\\ -- left quotient

% -- remainder

^ -- power

^** -- tensor power

/^ -- divided power

! -- factorial

++ -- direct sum

** -- tensor product

<< -- file output, bit shifting

>> -- bit shifting

_ -- subscripting

. -- hash table access or assignment

.? -- test for hash table access

# -- hash table access; length of a list, sequence or hash table

#? -- test for hash table access

| -- horizontal concatenation of strings or matrices

|| -- vertical concatentation of strings or matrices

& -- bit-wise and

: -- ideal quotient, repetitions

\ -- applying a function to elements of a list

==> -- attaching options to a function

@@ -- composing functions

@ -- a binary operator

&& -- a binary operator

^^ -- a binary operator

~ -- making a coherent sheaf