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--- notes:perl_cheat_sheet [2026/11/01 08:14]
100.6.3.96 old revision restored (2026/09/23 04:35)
+++ notes:perl_cheat_sheet [2026/11/03 15:51] (current)
216.73.217.9 old revision restored (2026/11/02 18:14)
@@ Line 12: / Line 12: @@
   * "use strict;" requires variable declaration
   * Comments start with # (no block comments)
-  * Parenthesis are optional unless part of syntax.
@@ Line 24: / Line 23: @@
   * When a scalar is interpreted as a boolean, the following are //false// : 0, '0', %%''%%, undefined .
   * !! is a handy shortcut to convert any scalar to 0 or 1 (to represent a boolean)
-  * Variables have value ''undef'' before being assigned. ''undef'' acts as a 0 or "" as needed, but will throw a warning if printed.
-  * ''defined()'' checks if a variable has been defined. Can also set a variable to ''undef''.
-===== Lists and Arrays =====
-  * A list is an ordered set of elements (each of which is a scalar value), starting with position 0.
-  * An array is a variable that stores a list (separate namespace from scalar variables).
-  * To access an element of an array - ''$myarr[0]'' - ''undef'' if never set.
-  * Index of last element is in ''$#arr''
-  * Negative array indices wrap around (only once) so -1 refers to last element.
-  *
 ===== Numbers =====

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