Unit 6-lists, loops, and transversals

an ordered collection of elements

an individual value in a list that is assigned a unique index

a common method for referencing the elements in a list or string using numbers (lists in Javascript start with index 0

how many elements it contains, The length of the list is 1 more than the last index

They allow us to name and program with large collections of information while ignoring the low level details of how the data is stored, organized, etc.

uses a boolean condition to repeatedly run a block of code. If it is true it runs the block of code contained within it. -This process of checking the condition and running the block of code is repeated as long as the Boolean condition remains true. -Once the Boolean expression becomes false it will stop.

condenses the parts of a while loop into a shorter statement. Like the while loop, once the Boolean expression becomes false, the loop ends.

Create a count/index variable Ex. var count = 0 Write a while loop to check a condition Ex. while (count <10)… Increase/Decrease the value of count/index variable Ex. …count ++

Iteration (loops): a repetitive portion of an algorithm which repeats a specified number of times, while a condition is met, or until a given condition is no longer met - an example is loops!

occurs when the while condition is always true (or the ending condition will never occur); will result in cycling through a set of commands forever without stopping

Use a function when you have a piece of code (a procedure) that you might reuse in other places in your program. Use a loop when there is something you need to do over and over again repeatedly (consecutively) or when you don’t want to call a function many times in a row manually. Use a loop when you don’t want to call a function many times in a row manually

Simulations are models of the real world that allow the user to investigate hypotheses and draw conclusions by inputting various sets of data or values to demonstrate the changing state of a phenomenon. -Simulations allow us to test solutions or run experiments in a way that is usually cheaper, safer, and often times faster.

finite set of instructions that accomplish a specific task.

the process of accessing each item in a list one at a time

they manage complexity in programs by giving a collection of data a name without referencing the specific details of the representation.

change the sequential flow of control by repeating a set of statements zero or more times, until a stopping condition is met

iteration statement

a part of an existing string