Brodriguez: Brodriguez moved page Dictionaries to Programming/Dictionaries

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Brodriguez moved page Dictionaries to Programming/Dictionaries

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	=== Initialization ===		=== Initialization ===
	Generally speaking, dictionaries can be initialized as empty:		Generally speaking, dictionaries can be initialized as empty:
	my_dict = {}.		my_dict = {}

	Or with initial values:		Or with initial values:

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Similarly to [[Arrays]], dictionaries are data structures meant to store groups of items.

Conceptually, the biggest difference is that dictionary values are accessed via a "key", rather than an index number.<br>
This key can be anything the programmer desires, such as a string, an integer, etc. The only stipulation is that each unique key refers to a single value. Each one of these entries is generally referred to as a "Key-Value" pair.

Furthermore, unlike arrays, most languages automatically handle dictionary size for you in the background.

Generally speaking, the syntax for dictionaries in most languages uses { } (braces/curly brackets).

== Core Operations ==
Note that syntax for these will vary wildly depending on the language. See documentation of your specific language for syntax details.

=== Initialization ===
Generally speaking, dictionaries can be initialized as empty:
my_dict = {}.

Or with initial values:
my_dict = {
"Ice Cream" = 50,
"Burgers" = 56,
"Pizza" = 102,
}

=== Accessing a Key-Value Pair ===
For most languages, access a Key-Value pair by putting the key in [ ] (square brackets). Ex:
pizza_count = my_dict["Pizza"];

=== Adding a New Key-Value Pair ===
For most languages, a new Key-Value pair is established by combining an assignment statement and the above "access" syntax. Ex:
my_dict["Pizza"] = 103;

=== Removing a Key-Value Pair ===
Syntax for this tends to vary quite a bit. But two examples of removing the "Pizza" value from the dictionary are:
my_dict.Remove("Pizza");

del my_dict["Pizza"];

Programming/Dictionaries - Revision history

Brodriguez: Brodriguez moved page Dictionaries to Programming/Dictionaries

Brodriguez: Formatting

Brodriguez: Create page