Learn to Code with Blockly: Loops
Loop Definition
In programming, a loop is a programming structure that repeats a set of instructions until a specified condition is met. Loops are commonly used in programming because, compared to repeated lines of code, they save time, reduce error, and are easy to read.
A loop to play a sound may look like this:
UNTIL 4 sounds have been played:
Play a sound
For Loop Definition
In programming, a for loop executes a set of instructions for a specified number of times.
A for loop to add landmarks to a map may look like this:
UNTIL 20 landmarks have been added to the map:
Add landmark to map
For Each Loop Definition
In programming, a for each loop executes a set of instructions for each item in a given collection.
A for each loop to add a list of destinations to a tourism application may look like this:
FOR EACH destination in the list:
Add destination to app
While Loop Definition
In programming, a while loop executes a block of code as long as a given condition evaluates to true.
A while loop to make sandwhichs as long as there is bread left may look like this:
WHILE there is bread left:
Make a sandwich
