Nushell Usage Patterns

Critical Distinctions

Pipeline Input vs Parameters

CRITICAL: Pipeline input ($in) is NOT interchangeable with function parameters!

# ❌ WRONG - treats $in as first parameter
def my-func [list: list, value: any] {
    $list | append $value
}

# ✅ CORRECT - declares pipeline signature
def my-func [value: any]: list -> list {
    $in | append $value
}