Overview - Chapter: 0:History, 1:Design, 2:Basics, 3:Var, 4:Op, 5:IO, 6:{}, 7:Sub, 8:OOP, 9:Rx, 10:Meta
Intro - Appendices: A:Index, B:Tables, C:Cook, D:Delta, E:Best of, F:Links

Perl folkore: Perl is an operator based language.

Comparison and testing in the scalar context

Smartmatch

~~ !~

Equality

eqv eq == ===
!= !==

Generic Comparsion

before after cmp

Numerical Comparsion

< == > <=> <= >=

String Comparsion

lt eq gt leg le ge

joined comparison

3 < $a == $a < 7

is not the same as

3 < $a < 7

because latter is evaled at once and the first in 2 steps (left to right)

junctions

| & ^

logical selection

&& - and
|| - or
// - err
^^ - xor

see also numerical selection

ternary

?? !!

flipflop

ff fff

file test

table

yadda

...
???
!!!

context forcing scalar ops

bool context

? !
?& ?| ?^

numeric context

+ - * ? / % %%
+& +| +^ +< +>

numerical selection

min max minmax

String context

~ x
~& ~| ~^ ~< ~>

Ops for arrays/lists

List generation

The simplest way to create a list is by repeating some values:

'munch' xx 3 # results in 'munch', 'munch', 'munch'
('hallo', 'echo') xx 2 --> 'hallo', 'echo', 'hallo', 'echo'

In list context the range operator produces lists:

@ 2 .. 7 --> 2,3,4,5,6,7

... sequence operator

Zip

Z

Combinators

X

Hyperops

<< >>

Reduce

[ ]

Triangle

[\ ]

Feed Ops

<== ==>

Assignment ops

self assigning ops

precedence table

is in Appendic B

intentionally not existing ops

making own operators

Overview - Chapter: 0:History, 1:Design, 2:Basics, 3:Var, 4:Op, 5:IO, 6:{}, 7:Sub, 8:OOP, 9:Rx, 10:Meta
Intro - Appendices: A:Index, B:Tables, C:Cook, D:Delta, E:Best of, F:Links