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<head>
    <meta charset="utf-8">
    <title>JSDoc: Class: Map</title>

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    <h1 class="page-title">Class: Map</h1>

    
<section>

<header>
    
        <h2>
            <span class="ancestors"><a href="ProtoBuf.html">ProtoBuf</a>.</span>
        
        Map
        </h2>
        
    
</header>

<article>
    <div class="container-overview">
    
        
    <h4 class="name" id="Map"><span class="type-signature"></span>new Map<span class="signature">(field<span class="signature-attributes">non-null</span>, contents<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span></h4>

    
<div class="description">
    <p>Constructs a new Map. A Map is a container that is used to implement map
fields on message objects. It closely follows the ES6 Map API; however,
it is distinct because we do not want to depend on external polyfills or
on ES6 itself.</p>
</div>


    <h5>Parameters:</h5>
    

<table class="params">
    <thead>
    <tr>
        
        <th>Name</th>
        

        <th>Type</th>

        
        <th>Attributes</th>
        

        <th class="last">Description</th>
    </tr>
    </thead>

    <tbody>
    

        <tr>
            
                <td class="name"><code>field</code></td>
            

            <td class="type">
            
                
<span class="param-type">ProtoBuf.Reflect.Field</span>


            </td>

            
                <td class="attributes">
                

                </td>
            

            <td class="description last"><p>Map field</p></td>
        </tr>

    
        <tr>
            
                <td class="name"><code>contents</code></td>
            

            <td class="type">
            
                
<span class="param-type">Object.&lt;string, *></span>


            </td>

            
                <td class="attributes">
                
                    &lt;optional><br>
                

                </td>
            

            <td class="description last"><p>Initial contents</p></td>
        </tr>

    
    </tbody>
</table>


<dl class="details">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="protobuf.js.html">protobuf.js</a>, <a href="protobuf.js.html#line4934">line 4934</a>
    </li></ul></dd>
    

</dl>


    </div>

    
        <h3 class="subsection-title">Members</h3>

        
<h4 class="name" id="field"><span class="type-signature">(non-null) </span>field<span class="type-signature"> :ProtoBuf.Reflect.Field</span></h4>


<div class="description">
    <p>The field corresponding to this map.</p>
</div>


    <h5>Type:</h5>
    <ul>
        <li>
            
<span class="param-type">ProtoBuf.Reflect.Field</span>


        </li>
    </ul>


<dl class="details">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="protobuf.js.html">protobuf.js</a>, <a href="protobuf.js.html#line4942">line 4942</a>
    </li></ul></dd>
    

</dl>


<h4 class="name" id="keyElem"><span class="type-signature">(non-null) </span>keyElem<span class="type-signature"> :<a href="ProtoBuf.Reflect.Element.html">ProtoBuf.Reflect.Element</a></span></h4>


<div class="description">
    <p>Element instance corresponding to key type.</p>
</div>


    <h5>Type:</h5>
    <ul>
        <li>
            
<span class="param-type"><a href="ProtoBuf.Reflect.Element.html">ProtoBuf.Reflect.Element</a></span>


        </li>
    </ul>


<dl class="details">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="protobuf.js.html">protobuf.js</a>, <a href="protobuf.js.html#line4948">line 4948</a>
    </li></ul></dd>
    

</dl>


<h4 class="name" id="map"><span class="type-signature">(non-null) </span>map<span class="type-signature"> :Object.&lt;string, {key: *, value: *}></span></h4>


<div class="description">
    <p>Internal map: stores mapping of (string form of key) -&gt; (key, value)
pair.</p>
<p>We provide map semantics for arbitrary key types, but we build on top
of an Object, which has only string keys. In order to avoid the need
to convert a string key back to its native type in many situations,
we store the native key value alongside the value. Thus, we only need
a one-way mapping from a key type to its string form that guarantees
uniqueness and equality (i.e., str(K1) === str(K2) if and only if K1
=== K2).</p>
</div>


    <h5>Type:</h5>
    <ul>
        <li>
            
<span class="param-type">Object.&lt;string, {key: *, value: *}></span>


        </li>
    </ul>


<dl class="details">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="protobuf.js.html">protobuf.js</a>, <a href="protobuf.js.html#line4970">line 4970</a>
    </li></ul></dd>
    

</dl>


<h4 class="name" id="valueElem"><span class="type-signature">(non-null) </span>valueElem<span class="type-signature"> :<a href="ProtoBuf.Reflect.Element.html">ProtoBuf.Reflect.Element</a></span></h4>


<div class="description">
    <p>Element instance corresponding to value type.</p>
</div>


    <h5>Type:</h5>
    <ul>
        <li>
            
<span class="param-type"><a href="ProtoBuf.Reflect.Element.html">ProtoBuf.Reflect.Element</a></span>


        </li>
    </ul>


<dl class="details">

    
    <dt class="tag-source">Source:</dt>
    <dd class="tag-source"><ul class="dummy"><li>
        <a href="protobuf.js.html">protobuf.js</a>, <a href="protobuf.js.html#line4954">line 4954</a>
    </li></ul></dd>
    

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