little_helpers/tikz/sketch-0.2.161/Doc/sketch/Blocks.html

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  56 <h4 class="subsection">3.2.7 Blocks</h4>
  57
  58 <p><a name="index-block-327"></a><a name="index-_0040_007b-_0040_007d_0040r_007b_002c-block-drawable_007d-328"></a>Any sequence of drawables may be grouped in a <dfn>block</dfn> merely by
  59 enclosing them in braces <span class="samp">{ }</span>.  A block is itself drawable.  A
  60 key use of blocks is to extend the effect of a single <code>def</code>,
  61 <a href="Definitions.html#Definitions">Definitions</a>, <code>put</code> <a href="Puts.html#Puts">Puts</a>, <code>sweep</code> <a href="Sweeps.html#Sweeps">Sweeps</a>,
  62 or <code>repeat</code> <a href="Repeats.html#Repeats">Repeats</a> to include several objects rather than
  63 one.
  64
  65    <p>Definitions (See <a href="Definitions.html#Definitions">Definitions</a>.) inside a block have <dfn>lexical
  66 scope</dfn>
  67 <a name="index-lexical-scope-329"></a><a name="index-scope_002c-identifier-330"></a>extending from the place of definition to the end of the block.
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