Snap!

Examples:

Hello, World!:

Example for versions Snap! 4.0

Unlike Scratch, in Snap! each script must start with a “hat” block defining the condition upon which the script runs. “When green flag clicked” hat runs the script upon presentation start.

Factorial:

Example for versions Snap! 4.0

This example shows iterative calculation of factorial. To output results in required multiline format a global list variable is used.

Factorial:

Example for versions Snap! 4.0

This example uses recursive method of factorial calculation. Snap! allows to create user-defined blocks, in this case factorial block of type reporter (a block that returns a value, i.e. a function block). The newly defined block appears in the blocks palette immediately, and can be used when editing its own definition, thus allowing recursive calls.

Fibonacci numbers:

Example for versions Snap! 4.0

This example uses recursive calculation of Fibonacci numbers. To speed up calculations, newly found numbers are written to “cache” which is simply a global list.

Quadratic equation:

Example for versions Snap! 4.0

In Snap! block join conveniently allows to concatenate arbitrary number of arguments.

CamelCase:

Example for versions Snap! 4.0

Snap! has a slightly larger list of built-in blocks than Scratch; for example, blocks unicode of _ and unicode _ as letter are built-in. In this example these blocks are used to define blocks isLetter, toLower and toUpper, equivalent to functions of the same name in other languages.