# Composition

> How JSONata expressions compose — relevant anywhere you write expressions in Fuuz: screen transforms, validation expressions, data flow transforms, and…

Source: https://www.fuuz.com/help/composition
Last updated: 2026-06-16

How-To Guides · Expressions and scripting


Last updated June 16, 2026, 1:09 PM UTC

How JSONata expressions compose — relevant anywhere you write expressions in Fuuz: screen transforms, validation expressions, data flow transforms, and saved scripts.

In JSONata, everything is an *expression* . An expression comprises *values* , *functions* and *operators* which, when *evaluated* , produces a resulting value. Functions and operators are applied to values which themselves can be the results of evaluating sub-expressions. In that way, the language is fully *composable* to any level of complexity.

## Parenthesized Expressions and Blocks

Used to override the operator precedence rules. E.g.

- `(5 + 3) * 4`

Used to compute complex expressions on a context value:

- `Product.(Price * Quantity)` — both Price and Quantity are properties of the Product object

Used to support 'code blocks' — multiple expressions, separated by semicolons:

- `(expr1; expr2; expr3)`

Each expression in the block is evaluated *in sequential order* ; the result of the last expression is returned from the block.

## See Also

- [Jsonata Tutorial](https://www.fuuz.com/help/jsonata-tutorial)
- [Comparison Operators](https://www.fuuz.com/help/comparison-operators)
- [Boolean Operators](https://www.fuuz.com/help/boolean-operators)
- [Array Functions](https://www.fuuz.com/help/array-functions)
- [Custom Fuuz Only JSONata Library](https://www.fuuz.com/help/custom-fuuz-only-jsonata-library)

### Need more help?

Ask the Fuuz community, or open a ticket with Fuuz support.

[Ask the community](https://www.fuuz.com/community) [Open a ticket](https://support.fuuz.com/portal/en/newticket)

On this page

[Parenthesized Expressions and Blocks](#parenthesized-expressions-and-blocks)

[See Also](#see-also)