Function names should comply with a naming convention

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Metadata

ID: swift-code-style/function-names

Language: Unknown

Severity: Notice

Category: Code Style

Description

Function names should consistently follow the team’s established naming convention. Using a standard format makes code easier to read, maintain, and understand across the codebase. Any function name that doesn’t match the required pattern (such as starting with a lowercase letter) should be updated to align with the convention.

Non-Compliant Code Examples

import Foundation

// NON-COMPLIANT: This function name starts with an uppercase letter (PascalCase),
// which violates the lower-camel-case convention.
func DoSomething() {
    print("Doing something...")
}

Compliant Code Examples

import Foundation

// COMPLIANT: This function name follows the lower-camel-case convention.
// It starts with a lowercase letter.
func doSomething() {
    print("Doing something...")
}

// COMPLIANT: A multi-word example that also follows the convention.
func calculateArea(width: Double, height: Double) -> Double {
    return width * height
}

// COMPLIANT: Another example adhering to the rule.
func printUserDetails(name: String, age: Int) {
    print("User: \(name), Age: \(age)")
}

// allow leading underscore
func _invalidPrivateFunction() {
    print("This is an invalid private function name.")
}