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Datastar Helper Functions

Advanced signal patterns and helper utilities

Logical Operators

Use all(), any() helpers and composable operators: & (AND), | (OR), ~ (NOT)

All fields filled:
Form valid (using &):
Has name OR email:
Terms NOT agreed:

Mathematical Operations

Use Math helpers and rounding functions for calculations

Sum:
Maximum:
Square root of A:
Random number:

Template Function f()

Create dynamic template strings with signal interpolation

Basic template:
Email status:
Current time:

Value Fallbacks with value()

Handle empty or undefined values gracefully using the value() helper

Name with fallback:
Email with fallback:
Conditional greeting:

Array Operations

Work with arrays using built-in methods and JavaScript helpers

Array contents:
Array length:
Array sum:

Key Takeaways

Use all() and any() for readable multi-condition logic
Leverage Math.* functions for calculations and rounding
f() templates handle complex string interpolation
Pipe operator (|) creates fallbacks using JavaScript's || logic
Array methods (.push, .length) provide clean manipulation
JavaScript expressions integrate seamlessly with Python signals