Syntactic sugar for safe navigation operator (&.)

Question

str = "Hello World!"
str.[] /Hello/    # => "Hello"
str[/Hello/]      # => "Hello", syntactic suger version

str = nil
str&.[] /Hello/   # => nil
str&.[/Hello/]    # => SyntaxError: unexpected '[', expecting '('
str[/Hello/]      # => NoMethodError: undefined method `[]' for nil:NilClass

How can I use the safe navigation operator ( &.) for syntactic sugar for a method []?

Answer 1

How can I use the safe navigation operator ( &.) for syntactic sugar for a method []?

He can not. Matz does not want this.

This function has been requested and has already been rejected twice:

• Error # 11618: safe call syntax using isf or aset
• Feature # 11813: Extending a Safe Navigation Operator for []and []=Using Syntax Sugar

Matz says :

I am not going to add safe navigation for isf and aset. Perhaps you can use a.?[](x)(call operator method).

Answer 2

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