You write expressions that hold up even with incomplete data.

What you can do with this belt

You write your first expressions, filter and clean up arrays and test loops with just a few items.

7 techniques with their own page, 26 questions in the belt exam.

• Tip 3

  Filter array in Advanced Mode

  You filter arrays with your own expressions in Advanced Mode.

  StandardArrays & filters
• Tip 5

  Fixed values in Compose instead of variables

  You use variables only for values that actually change.

  StandardFlow structure & readability
• Tip 7

  Remove duplicates with union()

  You create unique values with union() and then filter them with Filter array.

  StandardArrays & filters
• Tip 36

  Test with Static Result without changing data

  You test flows with simulated results without changing real data.

  StandardTesting & debugging
• Tip 59

  Safe access with the ? operator

  You access properties that may be missing in a robust way.

  StandardExpressions
• Tip 148

  Shorten loops with take() while testing

  You test loops with a few items without restructuring the flow.

  StandardTesting & debugging
• Tip 155

  float() before div() for correct decimals

  You calculate percentages and ratios with correct decimal places.

  StandardExpressions

Start the belt examOn to the orange belt