AP CSP BJC Unit 2 Vocabulary

variable

labeled box that can hold one value at a time (word, costume, list, etc.)

local variable

variable that can only be set and used in the environment in which it is defined (inputs to procedures, variables in `for` or `script variables`)

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global variable

variable that is usable by all scripts in the program

predicate

hexagonal reporter; reports boolean value

boolean value

true or false value

conditional

controls code based on a boolean

element

item in a list; has unique indexes

index

position number of an item in a list or string

sublist

list used as an item in another list

data type

what kind of data something is (number, list, etc.)

primitive data type

data type that is built into a programming language (number, text, boolean, etc.)

abstract data type

custom data type that is meaningful to the program

constructor

constructs an example of the data structure

selector

select one piece of the data structure

data abstraction

use of abstract data types in a program

table

two-dimensional data structure; has rows and columns

composition

using the output from one function as the input to another function

traversing a list

looking at each item in a list (`for each` is iterative, like `for`, but does not use indexes)

domain

input type that a function accepts

range

output type that a function reports

selection

selecting which part of a program to run based on a boolean value

boolean function

`and`, `or`, and `not` functions; domain and range are boolean

nested conditional

conditional inside another conditional

string

ordered sequence of characters

software library

collection of procedures that can be used in a program

application program interface (API)

documents what a programmer needs to know about a library; description of procedures’ purposes, inputs, outputs

higher-order function

function that takes a function as an input

Creative Commons

specific family of copyright licenses; allow others to use, share, maybe sell, and maybe revise the work

free software

anyone can copy, use, modify, and redistribute, including commercially, provided that any modifications are under the same license

open-source software

code is available to anyone

open access research reports

available for free download