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<title>Lazy.js - Library Performance Comparisons</title>
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<header>
<h1><a href="index.html">lazy.js</a></h1>
<a href="https://github.com/dtao/lazy.js" class="github-ribbon"></a>
</header>
<nav data-sections=".benchmark-results-section">
<ul>
<li class="selected"><a href="#benchmark-results-10">10 Elements</a></li>
<li><a href="#benchmark-results-100">100 Elements</a></li>
<li><a href="#benchmark-results-other">Other</a></li>
</ul>
</nav>
<form>
<p>
Select the tests you want to run below, choose either
<label><input id="test-each" type="radio" checked="checked"><code>each</code></input></label> or
<label><input id="test-to-array" type="radio"><code>toArray</code></input></label>
<a class="why-to-array-vs-each" href="javascript:void(0);">(why?)</a>, and
<button class="start-benchmarking">start benchmarking</button>
to compare Lazy.js,
<a href="http://underscorejs.org/">Underscore</a>,
<a href="http://lodash.com">Lo-Dash</a>,
<a href="http://fitzgen.github.io/wu.js/">wu.js</a>,
<a href="http://sugarjs.com/">Sugar</a>,
<a href="https://github.com/suckgamoni/fromjs/">From.js</a>,
<a href="http://rx.codeplex.com/">IxJS</a>,
<a href="http://www.boilerjs.com/">Boiler.js</a>, and
<a href="http://rfw.name/sloth.js/">sloth.js</a>.
</p>
<p>
You can also choose to display results in
<label><input id="test-absolute" type="radio" checked="checked">absolute ops/second</input></label>,
<label><input id="test-proportional" type="radio">in proportion to the fastest method</input></label>, or
<label><input id="test-proportional-lodash" type="radio">in proportion to Lo-Dash</input></label>
(which is generally the fastest of the popular JS utility libraries). Proportional results
will likely be easier to read when you've selected many benchmarks.
</p>
</form>
<div id="why-to-array-vs-each">
<p>
Comparing the performance of Lazy.js to other libraries like Underscore and Lo-Dash is
unfortunately not black and white. On the one hand, calling <code>toArray</code> on the
result of a Lazy sequence will give you an actual JavaScript array, which you might need if,
e.g., you're passing the result to a function from an external library. However, in most
cases when you use methods like <code>map</code> or <code>filter</code>, you are probably
just going to do something while iterating over the result. In this case, you don't need an
array at all; calling <code>each</code> on a <code>Lazy.Sequence</code> will be functionally
indistinguishable from calling <code>_.each</code> on an array.
</p>
<p>
Generally speaking, Lazy.js performs best (and "wins" more performance races) when you
<em>don't</em> have to call <code>toArray</code>. However, when chaining methods together
it's often still the fastest solution regardless.
</p>
</div>
<section id="benchmark-results-10"
class="benchmark-results-section">
<div id="benchmark-results-chart-10" class="column-chart"
data-title="Ops/second - 10 elements"
data-source="#benchmark-results-table-10"
data-transpose="true"
data-row-filter="benchmarkChartRowFilter"
data-options="benchmarkChartOptions">
</div>
<p>
Select:
<button class="select-all">All</button>
<button class="select-none">None</button>
<button class="clear-selected">Clear</button>
</p>
<table id="benchmark-results-table-10" class="benchmark-results-table">
<tr>
<th>Test</th>
<th>Underscore</th>
<th>Lo-Dash</th>
<th>Wu.js</th>
<th>Sugar</th>
<th>From.js</th>
<th>IxJS</th>
<th>Boiler.js</th>
<th>Sloth.js</th>
<th>Lazy.js</th>
</tr>
</table>
</section>
<section id="benchmark-results-100"
class="benchmark-results-section"
style="display: none;">
<div id="benchmark-results-chart-100" class="column-chart"
data-title="Ops/second - 100 elements"
data-source="#benchmark-results-table-100"
data-transpose="true"
data-row-filter="benchmarkChartRowFilter"
data-options="benchmarkChartOptions">
</div>
<p>
Select:
<button class="select-all">All</button>
<button class="select-none">None</button>
<button class="clear-selected">Clear</button>
</p>
<table id="benchmark-results-table-100" class="benchmark-results-table">
<tr>
<th>Test</th>
<th>Underscore</th>
<th>Lo-Dash</th>
<th>Wu.js</th>
<th>Sugar</th>
<th>From.js</th>
<th>IxJS</th>
<th>Boiler.js</th>
<th>Sloth.js</th>
<th>Lazy.js</th>
</tr>
</table>
</section>
<section id="benchmark-results-other"
class="benchmark-results-section"
style="display: none;">
<div id="benchmark-results-chart-other" class="column-chart"
data-title="Ops/second - other"
data-source="#benchmark-results-table-other"
data-transpose="true"
data-row-filter="benchmarkChartRowFilter"
data-options="benchmarkChartOptions">
</div>
<p>
Select:
<button class="select-all">All</button>
<button class="select-none">None</button>
<button class="clear-selected">Clear</button>
</p>
<table id="benchmark-results-table-other" class="benchmark-results-table">
<tr>
<th>Test</th>
<th>Underscore</th>
<th>Lo-Dash</th>
<th>Wu.js</th>
<th>Sugar</th>
<th>From.js</th>
<th>IxJS</th>
<th>Boiler.js</th>
<th>Sloth.js</th>
<th>Lazy.js</th>
</tr>
</table>
</section>
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