d3.easeBackIn(t) Anticipatory easing, like a dancer bending his knees before jumping off the floor. The degree of overshoot is configurable; it not specified, it defaults to 1.70158.

d3.select(selector) Selects the first element that matches the specified selector string. If no elements match the selector, returns an empty selection. If multiple elements match the selector, only the first matching element (in document order) will be selected. For example, to select the first anchor element: var anchor = d3.select("a"); If the selector is not a string, instead selects the specified node; this is useful if you already have a reference to a node, such as this within an event

radialArea.radius([radius]) Equivalent to area.y, except the accessor returns the radius: the distance from the origin ⟨0,0⟩.

path.rect(x, y, w, h) Creates a new subpath containing just the four points ⟨x, y⟩, ⟨x + w, y⟩, ⟨x + w, y + h⟩, ⟨x, y + h⟩, with those four points connected by straight lines, and then marks the subpath as closed. Equivalent to context.rect and uses SVG’s “lineto” commands.

d3.geoMtFlatPolarQuartic() d3.geoMtFlatPolarQuarticRaw The McBryde–Thomas flat-polar quartic pseudocylindrical equal-area projection.

selection.empty() Returns true if this selection contains no (non-null) elements.

d3.geoBottomley() d3.geoBottomleyRaw(sinPsi) The Bottomley projection “draws lines of latitude as concentric circular arcs, with arc lengths equal to their lengths on the globe, and placed symmetrically and equally spaced across the vertical central meridian.”

d3.geoHammer() d3.geoHammerRaw(A, B) The Hammer projection. Depending the chosen coefficient and aspect, also known as Eckert–Greifendorff, quartic authalic, and Briesemeister.

force(alpha) Applies this force, optionally observing the specified alpha. Typically, the force is applied to the array of nodes previously passed to force.initialize, however, some forces may apply to a subset of nodes, or behave differently. For example, d3.forceLink applies to the source and target of each link.

d3.arc() Constructs a new arc generator with the default settings.