ns_number_init_as_function_reference.md

Pattern: Missing use of .init(value:)

Issue: -

Description

Passing NSNumber.init or NSDecimalNumber.init as a function reference is dangerous as it can cause the wrong initializer to be used, causing crashes. Use .init(value:) instead.

Examples of correct code:

[0, 0.2].map(NSNumber.init(value:))

[0, 0.2].map { NSNumber(value: $0) }

[0, 0.2].map(NSDecimalNumber.init(value:))

[0, 0.2].map { NSDecimalNumber(value: $0) }

Examples of incorrect code:

[0, 0.2].map(↓NSNumber.init)

[0, 0.2].map(↓NSDecimalNumber.init)

Further Reading

• SwiftLint - NSNumber Init as Function Reference