FlowRun

Flowcharts, runnable in your browser!

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Features

• simple and fast flowchart editor
• run program inside your browser, locally
• export program into JSON
• readonly mode for documentation/tutorials
• predefined functions
• precise error reporting

Data types

• Integer - whole number
• Real - decimal number
• String - text
• Boolean - true/false
• Integer[] - array of Integers
• Real[] - array of Reals
• String[] - array of Strings
• Boolean[] - array of Booleans
• Integer[][] - matrix of Integers
• Real[][] - matrix of Reals
• String[][] - matrix of Strings
• Boolean[][] - matrix of Booleans

Operators

• +, -, *, /, % for arithmetic operations
• &&, ||, ! for boolean operations
• <, <=, ==, !=, >, >= for comparing numbers
• ==, != for comparing non-numeric values

The rules of precedence should be familiar to you from mathematics.
For example:

• * has higher precedence than +:
  2 + 2 * 2 == 2 + 4 == 6.
• && has higher precedence than ||:
  true || false && true == true || false == true.

Functions

You can define new functions and use them from your main function.
Functions have a return type, the type of value which it returns.
For example, if you calculate a sum of two Integers, the result would also be an Integer (return type).

The return type can also be Void, which means it doesn't return anything, it just executes and that's it.
For example, it could calculate something, print it and exit.

There are also some predefined functions that you can use, they are defined automatically in FlowRun.
You can find them here

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Implementation details

Written in ScalaJS.
Uses d3-graphviz to display the flowcharts.