yword">const</span> newValue = <span class="hljs-title function_">cb</span>(value, key, <span class="hljs-variable language_">this</span>);
    <span class="hljs-variable language_">this</span>.<span class="hljs-title function_">set</span>(key, newValue);
    <span class="hljs-keyword">return</span> <span class="hljs-variable language_">this</span>;
}</code></pre></emu-import>
        </emu-clause>
</emu-clause>

<emu-clause id="Map">
    <h1><span class="secnum">4</span> Map static methods</h1>
        <em