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Operators
urkerab edited this page Dec 22, 2017
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Operators are used to modify data and return it, for example to do arithmetic. They are classified as nilary, unary, binary or ternary depending on the number of arguments they take, and non-lazy or lazy depending on whether they take their arguments in evaluated form or non-evaluated form. There are also some operators that use their own syntax. In verbose mode they take the form of functions, similar to commands. Operands are denoted by x
, y
, z
and a
respectively.
Operator | Verbose | Returns |
---|---|---|
S |
InputString |
The next input as a string. |
N |
InputNumber |
The next input as a number. |
‽ |
Random |
0 or 1 with equal chance. |
KA |
PeekAll |
Every cell on the canvas, from left to right and top to bottom. |
KM |
PeekMoore |
Cells in a Moore neighborhood around the cursor |
KV |
PeekVonNeumann |
Cells in a Von Neumann neighborhood around the cursor. |
KK |
Peek |
The character under the cursor. |
ⅈ |
I /X
|
Current cursor x-position. |
ⅉ |
J /Y
|
Current cursor y-position. |
Operator | Verbose | Returns |
---|---|---|
± |
Negate |
-x . Vectorizes. |
L |
Length |
The length of x . |
¬ |
Not |
False if x is truthy, else True if x is falsy. |
I |
Cast |
x as a string if it is a number, or x as a number if it is a string. |
‽ |
Random |
A random integer between 0 and x , each number having equal chance to appear, or a randomly selected character if x is a string or a random element if x is a list. |
V |
Evaluate /eval
|
The result after executing x as a string. |
⊟ |
Pop |
The last value in x , after removing it from x . |
↧ |
Lowercase |
The lowercase equivalent of x if it has one. Vectorizes. |
↥ |
Uppercase |
The uppercase equivalent of x if it has one. Vectorizes. |
⌊ |
Minimum /min /Floor
|
The minimum value in x , or the floor of x if it is a number. |
⌈ |
Maximum /max /Ceiling /ceil
|
The maximum value in x , or the ceiling of x if it is a number. |
℅ |
Character /Ordinal /chr /ord
|
The character code of x if x is a character, or the character x is the character code of if x is an integer. |
⮌ |
Reverse |
x reversed. |
≕ |
GetVariable /getvar
|
The value of the variable x . |
″ |
Repeated |
Wolfram pattern-matching construct matching one or more of x . |
‴ |
RepeatedNull |
Wolfram pattern-matching construct matching zero or more of x . |
✂ |
Slice |
A new iterable containing the elements of x , if this is implemented in the underlying Python class. |
… |
Range |
Range from 0 to x , excluding x . |
…· |
InclusiveRange |
Range from 0 to x , including x . |
~ |
BitwiseNot |
The 2's complement of x . |
↔ |
Absolute /abs
|
abs(x) . Vectorizes. |
Σ |
Sum |
The sum of all elements in x if it is an array, digital sum if it is a number, sum of all numbers or digital sum if it is a string depending on whether it can be parsed as a single number. |
Π |
Product |
The product of all elements in x if it is an array, digital product if it is a number, product of all numbers or digital product if it is a string depending on whether it can be parsed as a single number. |
⊕ |
Incremented /++
|
x+1 , casting if it is a string. Vectorizes. |
⊖ |
Decremented /--
|
x-1 , casting if it is a string. Vectorizes. |
⊗ |
Doubled /***
|
x*2 , casting if it is a string. Vectorizes. |
⊘ |
Halved /\\
|
x/2 , casting if it is a string. Vectorizes. |
UV |
PythonEvaluate /pyeval
|
eval(x) . |
Operator | Verbose | Returns |
---|---|---|
⁺ |
Add /Plus
|
x+y . Vectorizes. |
⁻ |
Subtract /Minus
|
x-y , or x with y deleted if both x and y are strings. Vectorizes. |
× |
Multiply /Times
|
x*y . Vectorizes. |
÷ |
IntDivide /IntegerDivide
|
x//y . Vectorizes. |
∕ |
Divide |
x/y , or x split by y if x and y are strings, or x reduced using y if y is a function. Vectorizes. |
﹪ |
Modulo |
x%y . Note that this can be used to format strings. |
⁼ |
Equals |
Whether x is equal to y . |
‹ |
Less |
< |
› |
Greater |
> |
…· |
InclusiveRange |
[x, y] over the integers or characters. |
… |
Range |
[x, y) over the integers or characters. |
… |
CycleChop /Mold
|
x repeated and chopped to length y . |
X |
Exponentiate /Exponent /Power
|
x to the power of y . |
§ |
AtIndex |
x[y] , wrapping if needed. |
⊞O |
PushOperator |
x after pushing y to x . |
⪫ |
Join |
The result of joining x with y . |
⪪ |
Split |
The result of splitting x with y . |
⌕A |
FindAll |
The indices of y in x . |
⌕ |
Find |
The index of y in x . |
◧ |
PadLeft |
The result of left-padding x with y . |
◨ |
PadRight |
The result of right-padding x with y . |
№ |
Count |
The number of occurrences of y in x . |
➙ |
Rule |
Wolfram equivalent of named argument. Also used as match-replacement pair. |
⧴ |
DelayedRule |
Lazily evaluated rule, currently does nothing. |
? |
PatternTest |
Wolfram pattern-matching construct. Matches x only when y returns truthy. |
✂ |
Slice |
Every item of x starting at index y . |
⊙ |
Any |
True if y returns truthy for any element in x else False . |
⬤ |
All |
True if y returns truthy for all elements in x else False . |
Operator | Verbose | Returns |
---|---|---|
✂ |
Slice |
Every item of x starting at index y until (but not including) index z . |
Operator | Verbose | Returns |
---|---|---|
✂ |
Slice |
Every a items of x starting at index y until (but not including) index z . |
Operator | Verbose | Returns |
---|---|---|
∧ |
And /and
|
y if x and y are both truthy else False . Short-circuits. |
∨ |
Or /or
|
y if y is truthy, else x if x is truthy, else False . Short-circuits. |
Operator | Verbose | Returns |
---|---|---|
⎇ |
Ternary |
y if x is truthy else z . |
Operator | Verbose | Arguments | Returns |
---|---|---|---|
KD |
PeekDirection |
exp dir |
The cells in a line of length x in the direction y from the cursor, including the cell under the cursor. |
E |
Each /Map
|
exp exp |
An array arr where arr[i] is y(x[i]) . During evaluation of y , the loop variable and index are stored in the first two free variables in ικλμνξπρςστυφχψωαβγδεζηθ . |
▷ |
EvaluateVariable /evalvar
|
exp lst |
Runs the function in the variable x with y as its arguments. |
▷ |
EvaluateVariable /evalvar
|
exp exp |
evalvar with y as its sole argument. |
UP |
PythonFunction |
str lst |
Gets the function with a return value x from Python, and runs it with y as arguments. |