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Block Conversion Operator

The block conversion operator (&) is used to convert a proc into a block.

> [1,2,3,4].map(&->(x) { x * x })
=> [1, 4, 9, 16]

We can also do something called "Symbol to Proc" where a symbol referencing a method is converted to a proc which is then converted to a block argument.

> [1,2,3,4].map(&:*)
=> [1, 4, 9, 16]
> %w[one two three].map(&:upcase)
=> ["ONE", "TWO", "THREE"]

References