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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>
Class: Enumerator::Lazy
— Documentation by YARD 0.9.20
</title>
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<a href="../_index.html">Index (L)</a> »
<span class='title'><span class='object_link'><a href="../Enumerator.html" title="Enumerator (class)">Enumerator</a></span></span>
»
<span class="title">Lazy</span>
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<div id="content"><h1>Class: Enumerator::Lazy
</h1>
<div class="box_info">
<dl>
<dt>Inherits:</dt>
<dd>
<span class="inheritName"><span class='object_link'><a href="../Enumerator.html" title="Enumerator (class)">Enumerator</a></span></span>
<ul class="fullTree">
<li>Object</li>
<li class="next"><span class='object_link'><a href="../Enumerator.html" title="Enumerator (class)">Enumerator</a></span></li>
<li class="next">Enumerator::Lazy</li>
</ul>
<a href="#" class="inheritanceTree">show all</a>
</dd>
</dl>
<dl>
<dt>Defined in:</dt>
<dd>mrbgems/mruby-enum-lazy/mrblib/lazy.rb</dd>
</dl>
</div>
<h2>Overview</h2><div class="docstring">
<div class="discussion">
<p>== Acknowledgements</p>
<p>Based on https://github.com/yhara/enumerable-lazy
Inspired by https://github.com/antimon2/enumerable_lz
http://jp.rubyist.net/magazine/?0034-Enumerable_lz (ja)</p>
</div>
</div>
<div class="tags">
</div>
<h2>Constant Summary</h2>
<h3 class="inherited">Constants included
from <span class='object_link'><a href="../Enumerable.html" title="Enumerable (module)">Enumerable</a></span></h3>
<p class="inherited"><span class='object_link'><a href="../Enumerable.html#NONE-constant" title="Enumerable::NONE (constant)">Enumerable::NONE</a></span></p>
<h2>Instance Attribute Summary</h2>
<h3 class="inherited">Attributes inherited from <span class='object_link'><a href="../Enumerator.html" title="Enumerator (class)">Enumerator</a></span></h3>
<p class="inherited"><span class='object_link'><a href="../Enumerator.html#args-instance_method" title="Enumerator#args (method)">#args</a></span>, <span class='object_link'><a href="../Enumerator.html#fib-instance_method" title="Enumerator#fib (method)">#fib</a></span>, <span class='object_link'><a href="../Enumerator.html#meth-instance_method" title="Enumerator#meth (method)">#meth</a></span>, <span class='object_link'><a href="../Enumerator.html#obj-instance_method" title="Enumerator#obj (method)">#obj</a></span></p>
<h2>
Instance Method Summary
<small><a href="#" class="summary_toggle">collapse</a></small>
</h2>
<ul class="summary">
<li class="public ">
<span class="summary_signature">
<a href="#drop-instance_method" title="#drop (instance method)">#<strong>drop</strong>(n) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#drop_while-instance_method" title="#drop_while (instance method)">#<strong>drop_while</strong>(&block) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#flat_map-instance_method" title="#flat_map (instance method)">#<strong>flat_map</strong>(&block) ⇒ Object </a>
(also: #collect_concat)
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#grep-instance_method" title="#grep (instance method)">#<strong>grep</strong>(pattern) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#initialize-instance_method" title="#initialize (instance method)">#<strong>initialize</strong>(obj, &block) ⇒ Lazy </a>
</span>
<span class="note title constructor">constructor</span>
<span class="summary_desc"><div class='inline'><p>A new instance of Lazy.</p>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#map-instance_method" title="#map (instance method)">#<strong>map</strong>(&block) ⇒ Object </a>
(also: #collect)
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#reject-instance_method" title="#reject (instance method)">#<strong>reject</strong>(&block) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#select-instance_method" title="#select (instance method)">#<strong>select</strong>(&block) ⇒ Object </a>
(also: #find_all)
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#take-instance_method" title="#take (instance method)">#<strong>take</strong>(n) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#take_while-instance_method" title="#take_while (instance method)">#<strong>take_while</strong>(&block) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#to_enum-instance_method" title="#to_enum (instance method)">#<strong>to_enum</strong>(meth = :each, *args, &block) ⇒ Object </a>
(also: #enum_for)
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#uniq-instance_method" title="#uniq (instance method)">#<strong>uniq</strong>(&block) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
<li class="public ">
<span class="summary_signature">
<a href="#zip-instance_method" title="#zip (instance method)">#<strong>zip</strong>(*args, &block) ⇒ Object </a>
</span>
<span class="summary_desc"><div class='inline'>
</div></span>
</li>
</ul>
<h3 class="inherited">Methods inherited from <span class='object_link'><a href="../Enumerator.html" title="Enumerator (class)">Enumerator</a></span></h3>
<p class="inherited"><span class='object_link'><a href="../Enumerator.html#%2B-instance_method" title="Enumerator#+ (method)">#+</a></span>, <span class='object_link'><a href="../Enumerator.html#each-instance_method" title="Enumerator#each (method)">#each</a></span>, <span class='object_link'><a href="../Enumerator.html#each_with_index-instance_method" title="Enumerator#each_with_index (method)">#each_with_index</a></span>, <span class='object_link'><a href="../Enumerator.html#feed-instance_method" title="Enumerator#feed (method)">#feed</a></span>, <span class='object_link'><a href="../Enumerator.html#initialize_copy-instance_method" title="Enumerator#initialize_copy (method)">#initialize_copy</a></span>, <span class='object_link'><a href="../Enumerator.html#inspect-instance_method" title="Enumerator#inspect (method)">#inspect</a></span>, <span class='object_link'><a href="../Enumerator.html#next-instance_method" title="Enumerator#next (method)">#next</a></span>, <span class='object_link'><a href="../Enumerator.html#next_values-instance_method" title="Enumerator#next_values (method)">#next_values</a></span>, <span class='object_link'><a href="../Enumerator.html#peek-instance_method" title="Enumerator#peek (method)">#peek</a></span>, <span class='object_link'><a href="../Enumerator.html#peek_values-instance_method" title="Enumerator#peek_values (method)">#peek_values</a></span>, <span class='object_link'><a href="../Enumerator.html#produce-class_method" title="Enumerator.produce (method)">produce</a></span>, <span class='object_link'><a href="../Enumerator.html#rewind-instance_method" title="Enumerator#rewind (method)">#rewind</a></span>, <span class='object_link'><a href="../Enumerator.html#with_index-instance_method" title="Enumerator#with_index (method)">#with_index</a></span>, <span class='object_link'><a href="../Enumerator.html#with_object-instance_method" title="Enumerator#with_object (method)">#with_object</a></span></p>
<h3 class="inherited">Methods included from <span class='object_link'><a href="../Enumerable.html" title="Enumerable (module)">Enumerable</a></span></h3>
<p class="inherited"><span class='object_link'><a href="../Enumerable.html#__update_hash-class_method" title="Enumerable.__update_hash (method)">__update_hash</a></span>, <span class='object_link'><a href="../Enumerable.html#all%3F-instance_method" title="Enumerable#all? (method)">#all?</a></span>, <span class='object_link'><a href="../Enumerable.html#any%3F-instance_method" title="Enumerable#any? (method)">#any?</a></span>, <span class='object_link'><a href="../Enumerable.html#chain-instance_method" title="Enumerable#chain (method)">#chain</a></span>, <span class='object_link'><a href="../Enumerable.html#count-instance_method" title="Enumerable#count (method)">#count</a></span>, <span class='object_link'><a href="../Enumerable.html#cycle-instance_method" title="Enumerable#cycle (method)">#cycle</a></span>, <span class='object_link'><a href="../Enumerable.html#detect-instance_method" title="Enumerable#detect (method)">#detect</a></span>, <span class='object_link'><a href="../Enumerable.html#each_cons-instance_method" title="Enumerable#each_cons (method)">#each_cons</a></span>, <span class='object_link'><a href="../Enumerable.html#each_slice-instance_method" title="Enumerable#each_slice (method)">#each_slice</a></span>, <span class='object_link'><a href="../Enumerable.html#each_with_index-instance_method" title="Enumerable#each_with_index (method)">#each_with_index</a></span>, <span class='object_link'><a href="../Enumerable.html#each_with_object-instance_method" title="Enumerable#each_with_object (method)">#each_with_object</a></span>, <span class='object_link'><a href="../Enumerable.html#entries-instance_method" title="Enumerable#entries (method)">#entries</a></span>, <span class='object_link'><a href="../Enumerable.html#filter_map-instance_method" title="Enumerable#filter_map (method)">#filter_map</a></span>, <span class='object_link'><a href="../Enumerable.html#find_index-instance_method" title="Enumerable#find_index (method)">#find_index</a></span>, <span class='object_link'><a href="../Enumerable.html#first-instance_method" title="Enumerable#first (method)">#first</a></span>, <span class='object_link'><a href="../Enumerable.html#group_by-instance_method" title="Enumerable#group_by (method)">#group_by</a></span>, <span class='object_link'><a href="../Enumerable.html#hash-instance_method" title="Enumerable#hash (method)">#hash</a></span>, <span class='object_link'><a href="../Enumerable.html#include%3F-instance_method" title="Enumerable#include? (method)">#include?</a></span>, <span class='object_link'><a href="../Enumerable.html#inject-instance_method" title="Enumerable#inject (method)">#inject</a></span>, <span class='object_link'><a href="../Enumerable.html#lazy-instance_method" title="Enumerable#lazy (method)">#lazy</a></span>, <span class='object_link'><a href="../Enumerable.html#max-instance_method" title="Enumerable#max (method)">#max</a></span>, <span class='object_link'><a href="../Enumerable.html#max_by-instance_method" title="Enumerable#max_by (method)">#max_by</a></span>, <span class='object_link'><a href="../Enumerable.html#min-instance_method" title="Enumerable#min (method)">#min</a></span>, <span class='object_link'><a href="../Enumerable.html#min_by-instance_method" title="Enumerable#min_by (method)">#min_by</a></span>, <span class='object_link'><a href="../Enumerable.html#minmax-instance_method" title="Enumerable#minmax (method)">#minmax</a></span>, <span class='object_link'><a href="../Enumerable.html#minmax_by-instance_method" title="Enumerable#minmax_by (method)">#minmax_by</a></span>, <span class='object_link'><a href="../Enumerable.html#none%3F-instance_method" title="Enumerable#none? (method)">#none?</a></span>, <span class='object_link'><a href="../Enumerable.html#one%3F-instance_method" title="Enumerable#one? (method)">#one?</a></span>, <span class='object_link'><a href="../Enumerable.html#partition-instance_method" title="Enumerable#partition (method)">#partition</a></span>, <span class='object_link'><a href="../Enumerable.html#reverse_each-instance_method" title="Enumerable#reverse_each (method)">#reverse_each</a></span>, <span class='object_link'><a href="../Enumerable.html#sort-instance_method" title="Enumerable#sort (method)">#sort</a></span>, <span class='object_link'><a href="../Enumerable.html#sort_by-instance_method" title="Enumerable#sort_by (method)">#sort_by</a></span>, <span class='object_link'><a href="../Enumerable.html#tally-instance_method" title="Enumerable#tally (method)">#tally</a></span>, <span class='object_link'><a href="../Enumerable.html#to_h-instance_method" title="Enumerable#to_h (method)">#to_h</a></span></p>
<div id="constructor_details" class="method_details_list">
<h2>Constructor Details</h2>
<div class="method_details first">
<h3 class="signature first" id="initialize-instance_method">
#<strong>initialize</strong>(obj, &block) ⇒ <tt><span class='object_link'><a href="" title="Enumerator::Lazy (class)">Lazy</a></span></tt>
</h3><div class="docstring">
<div class="discussion">
<p>Returns a new instance of Lazy</p>
</div>
</div>
<div class="tags">
</div>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 30</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">initialize</span>(obj, &block)
<span style="color:#080;font-weight:bold">super</span>(){|yielder|
<span style="color:#080;font-weight:bold">begin</span>
obj.each{|x|
<span style="color:#080;font-weight:bold">if</span> block
block.call(yielder, x)
<span style="color:#080;font-weight:bold">else</span>
yielder << x
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">rescue</span> <span style="color:#036;font-weight:bold">StopIteration</span>
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</table>
</div>
</div>
<div id="instance_method_details" class="method_details_list">
<h2>Instance Method Details</h2>
<div class="method_details first">
<h3 class="signature first" id="drop-instance_method">
#<strong>drop</strong>(n) ⇒ <tt>Object</tt>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 89</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">drop</span>(n)
dropped = <span style="color:#00D">0</span>
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
<span style="color:#080;font-weight:bold">if</span> dropped < n
dropped += <span style="color:#00D">1</span>
<span style="color:#080;font-weight:bold">else</span>
yielder << val
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</div>
<div class="method_details ">
<h3 class="signature " id="drop_while-instance_method">
#<strong>drop_while</strong>(&block) ⇒ <tt>Object</tt>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 100</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">drop_while</span>(&block)
dropping = <span style="color:#069">true</span>
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
<span style="color:#080;font-weight:bold">if</span> dropping
<span style="color:#080;font-weight:bold">if</span> <span style="color:#080;font-weight:bold">not</span> block.call(val)
yielder << val
dropping = <span style="color:#069">false</span>
<span style="color:#080;font-weight:bold">end</span>
<span style="color:#080;font-weight:bold">else</span>
yielder << val
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</table>
</div>
<div class="method_details ">
<h3 class="signature " id="flat_map-instance_method">
#<strong>flat_map</strong>(&block) ⇒ <tt>Object</tt>
<span class="aliases">Also known as:
<span class="names"><span id='collect_concat-instance_method'>collect_concat</span></span>
</span>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 138</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">flat_map</span>(&block)
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
ary = block.call(val)
<span style="color:#777"># TODO: check ary is an Array</span>
ary.each{|x|
yielder << x
}
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="grep-instance_method">
#<strong>grep</strong>(pattern) ⇒ <tt>Object</tt>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 81</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">grep</span>(pattern)
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
<span style="color:#080;font-weight:bold">if</span> pattern === val
yielder << val
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="map-instance_method">
#<strong>map</strong>(&block) ⇒ <tt>Object</tt>
<span class="aliases">Also known as:
<span class="names"><span id='collect-instance_method'>collect</span></span>
</span>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 57</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">map</span>(&block)
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
yielder << block.call(val)
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="reject-instance_method">
#<strong>reject</strong>(&block) ⇒ <tt>Object</tt>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 73</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">reject</span>(&block)
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
<span style="color:#080;font-weight:bold">unless</span> block.call(val)
yielder << val
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="select-instance_method">
#<strong>select</strong>(&block) ⇒ <tt>Object</tt>
<span class="aliases">Also known as:
<span class="names"><span id='find_all-instance_method'>find_all</span></span>
</span>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 64</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">select</span>(&block)
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
<span style="color:#080;font-weight:bold">if</span> block.call(val)
yielder << val
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="take-instance_method">
#<strong>take</strong>(n) ⇒ <tt>Object</tt>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 114</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">take</span>(n)
<span style="color:#080;font-weight:bold">if</span> n == <span style="color:#00D">0</span>
<span style="color:#080;font-weight:bold">return</span> <span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){raise <span style="color:#036;font-weight:bold">StopIteration</span>}
<span style="color:#080;font-weight:bold">end</span>
taken = <span style="color:#00D">0</span>
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
yielder << val
taken += <span style="color:#00D">1</span>
<span style="color:#080;font-weight:bold">if</span> taken >= n
raise <span style="color:#036;font-weight:bold">StopIteration</span>
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</table>
</div>
<div class="method_details ">
<h3 class="signature " id="take_while-instance_method">
#<strong>take_while</strong>(&block) ⇒ <tt>Object</tt>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 128</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">take_while</span>(&block)
<span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>){|yielder, val|
<span style="color:#080;font-weight:bold">if</span> block.call(val)
yielder << val
<span style="color:#080;font-weight:bold">else</span>
raise <span style="color:#036;font-weight:bold">StopIteration</span>
<span style="color:#080;font-weight:bold">end</span>
}
<span style="color:#080;font-weight:bold">end</span></pre>
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</tr>
</table>
</div>
<div class="method_details ">
<h3 class="signature " id="to_enum-instance_method">
#<strong>to_enum</strong>(meth = :each, *args, &block) ⇒ <tt>Object</tt>
<span class="aliases">Also known as:
<span class="names"><span id='enum_for-instance_method'>enum_for</span></span>
</span>
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<pre class="code"><span class="info file"># File 'mrbgems/mruby-enum-lazy/mrblib/lazy.rb', line 45</span>
<span style="color:#080;font-weight:bold">def</span> <span style="color:#06B;font-weight:bold">to_enum</span>(meth=<span style="color:#A60">:each</span>, *args, &block)
<span style="color:#080;font-weight:bold">unless</span> <span style="color:#069">self</span>.respond_to?(meth)
raise <span style="color:#036;font-weight:bold">ArgumentError</span>, <span style="background-color:hsla(0,100%,50%,0.05)"><span style="color:#710">"</span><span style="color:#D20">undefined method </span><span style="background-color:hsla(0,0%,0%,0.07);color:black"><span style="font-weight:bold;color:#666">#{</span>meth<span style="font-weight:bold;color:#666">}</span></span><span style="color:#710">"</span></span>
<span style="color:#080;font-weight:bold">end</span>
lz = <span style="color:#036;font-weight:bold">Lazy</span>.new(<span style="color:#069">self</span>, &block)
lz.obj = <span style="color:#069">self</span>
lz.meth = meth
lz.args = args
lz
<span style="color:#080;font-weight:bold">end</span></pre>
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</table>
</div>
<div class="method_details ">
<h3 class="signature " id="uniq-instance_method">
#<strong>uniq</strong>(&block) ⇒ <tt>Object</tt>