Hybrid Expressions Example

This example demonstrates hybrid expressions that mix:

• get() function calls (from kdeps runtime API)
• Arithmetic operators (*, +, -, /)
• Comparison operators (>, >=, ==)
• Ternary operators (? :)

Key Feature

You can write expressions like:

doubled: "{{ get('multiplier') * 2 }}"

Examples in this Workflow

Arithmetic with API values

doubled: "{{ get('value') * 2 }}"
total: "{{ get('price') * get('quantity') }}"

Conditional logic

status: "{{ get('score') >= 80 ? 'Pass' : 'Fail' }}"

Default values

label: "{{ default(get('name'), 'unknown') }}"

Running the Example

kdeps run examples/hybrid-expressions/workflow.yaml

How It Works

The expr-lang evaluator:

1. Receives the kdeps context (memory, session, request params)
2. Provides kdeps functions like get(), set(), info(), default()
3. Allows arithmetic, comparison, and ternary operators within {{ }}

More Examples

# Arithmetic with stored values
price: "{{ get('base_price') * get('quantity') }}"

# Comparison
eligible: "{{ get('score') >= get('min_score') }}"

# Ternary
tier: "{{ get('score') >= 90 ? 'gold' : get('score') >= 70 ? 'silver' : 'bronze' }}"

# Default fallback
label: "{{ default(get('name'), 'anonymous') }}"