Variables enable dynamic computation and data transformation, acting like spreadsheet formulas that calculate values in real-time based on user responses and other data sources. Transform, calculate, and derive new values from existing data without requiring server-side processing. Variables

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How Variables Work

Real-time Evaluation

Variables update instantly as users provide responses, enabling dynamic content and calculations throughout your chatflow.

Aliases & Expressions

Create readable names for data sources, then write JavaScript expressions using these aliases to perform calculations.

Chaining Capability

Variables can reference other variables, enabling complex multi-step calculations and data transformations.

Transparent Calculations

All calculations are visible and auditable through JavaScript expressions, ensuring complete transparency.

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Common Use Cases

Financial Formulas & Computations
  • Basic arithmetic: income * 12 for annual salary
  • Advanced math: Math.pow(), Math.sqrt(), Math.round()
  • Financial calculations: loan payments, compound interest, ROI
  • Statistical operations: averages, percentages, ratios
// Calculate BMI
weight / (height * height)

// Monthly loan payment calculation  
principal * (rate * Math.pow(1 + rate, months)) / (Math.pow(1 + rate, months) - 1)

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Variable Editor

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Expression System

Variables use aliases connected to JavaScript expressions:
1

Create Aliases

Define readable names for your data sources:
  • userAge instead of complex resource references
  • monthlyIncome for salary responses
  • creditScore from external API calls
2

Write Expressions

Use JavaScript with your aliases to create calculations:
// Simple calculation
userAge >= 65 ? pensionAmount * 1.2 : pensionAmount

// Complex financial formula
Math.min(monthlyIncome * 0.28, (monthlyIncome * 0.36) - monthlyDebt)
3

Test & Validate

Use the expression tester with mock values to ensure your logic works correctly before deployment.
4

Deploy & Reference

Use your variables throughout the chatflow in messages, conditions, and other variables.

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Editor Features

Smart Autocompletion

  • Ctrl+Space triggers intelligent suggestions
  • Auto-detects available response fields
  • Suggests variable names and functions
  • Context-aware completions

Alias Management

  • Visual mapping of aliases to data sources
  • Automatic detection of undefined aliases
  • Smart suggestions for missing connections
  • Resource browser integration

Expression Testing

  • Test expressions with mock values
  • Validate complex calculations
  • Debug multi-step logic
  • Preview results before deployment

Error Handling

  • Built-in null checking capabilities
  • Default value support
  • Type validation assistance
  • Runtime error prevention

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Where to Use Variables

Variables integrate seamlessly throughout your chatflow:

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Real-World Examples

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Financial Services

// Calculate maximum loan amount
Math.min(
  monthlyIncome * 0.28 * 12 * loanTermYears, 
  (monthlyIncome * 0.36 - monthlyDebt) * 12 * loanTermYears
)

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Health & Insurance

// Body Mass Index with classification
weight / Math.pow(height / 100, 2)

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Best Practices

Descriptive Naming

Use Clear Variable NamesChoose names that explain the variable’s purpose:
  • monthlyMortgagePayment not payment
  • userAgeInYears not age
  • totalAnnualIncome not income

Error Prevention

Handle Edge CasesInclude validation and default values:
// Safe division with fallback
income > 0 ? expenses / income : 0

// Null checking
userName ? userName.trim() : "Guest"

Modular Design

Break Down Complex LogicCreate smaller, reusable variables:
  • grossMonthlyIncome → netMonthlyIncome → loanEligibility
  • Build calculation chains step by step
  • Make debugging easier

Documentation

Document Complex FormulasUse descriptive variable names and comments:
  • Explain business rules and assumptions
  • Document data sources and calculations
  • Include examples of expected inputs/outputs

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Performance & Reliability

Real-time CalculationVariables are calculated instantly as users progress through your chatflow:
  • Lightweight Processing - Client-side JavaScript execution
  • No Server Delays - Calculations happen in the user’s browser
  • Dynamic Updates - Values refresh automatically as inputs change
  • Reliable Performance - No external dependencies for basic calculations
Calculation LimitationsVariables support standard JavaScript with some restrictions:
  • Synchronous only - No async operations or API calls
  • No function declarations - Use expressions and built-in functions
  • Client-side only - Complex server-side calculations should use triggers
  • Memory limits - Very large datasets should be processed server-side

Conditional Logic

Use variables in branching logic to create dynamic flow paths

Triggers

Pass calculated values to external systems and automations

Entities Overview

Understanding the data sources available for variable calculations

Calculations

Advanced financial calculation capabilities and triggers