Haml's little-known list_of helper

TIL that given an Enumerable object and a block, the list_of method will iterate and yield the results of the block into sequential <li> elements.

Haml

%ul
  = list_of [1, 2, 3] do |item|
    Number #{item}

HTML

<ul>
  <li>Number 1</li>
  <li>Number 2</li>
  <li>Number 3</li>
</ul>

The list_of method also optionally takes a hash of options applied to the output li tags as attributes.

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