Today I Learned

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Numbered Parameters to Blocks in Ruby

Ruby blocks offer a shorthand to positional block variables.

Normally you'd see a block like this:

[1, 2, 3].each { |number| do_something(number) }
Ruby

However with Numbered Parameters, introduced in Ruby 2.7, we can express this like so:

[1, 2, 3].each { do_something(_1) }
Ruby

The _1 takes the place of an explicitly defined block variable.

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