an><a href="#springStiffness.springStiffness-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></li><li class="tsd-description"><div class="tsd-comment tsd-typography"><p>Returns the stiffness of the spring representing an edge.</p>
<p>The spring force between two vertexes connected by an edge is linearly proportional by distance
to the difference between the <a href="ForceDirectedLayout.html#springLength" class="tsd-kind-m