selection.node() Returns the first (non-null) element in this selection. If the selection is empty, returns null.

d3.namespaces The map of registered namespace prefixes. The initial value is: { svg: "http://www.w3.org/2000/svg", xhtml: "http://www.w3.org/1999/xhtml", xlink: "http://www.w3.org/1999/xlink", xml: "http://www.w3.org/XML/1998/namespace", xmlns: "http://www.w3.org/2000/xmlns/" } Additional prefixes may be assigned as needed to create elements or attributes in other namespaces.

log.nice() Like continuous.nice, except extends the domain to integer powers of base. For example, for a domain of [0.201479…, 0.996679…], and base 10, the nice domain is [0.1, 1]. If the domain has more than two values, nicing the domain only affects the first and last value.

band(value) Given a value in the input domain, returns the start of the corresponding band derived from the output range. If the given value is not in the scale’s domain, returns undefined.

d3.randomBates(n) Returns a function for generating random numbers with a Bates distribution with n independent variables.

d3.scaleQuantize() Constructs a new quantize scale with the unit domain [0, 1] and the unit range [0, 1]. Thus, the default quantize scale is equivalent to the Math.round function.

path.lineTo(x, y) Draws a straight line from the current point to the specified point ⟨x, y⟩. Equivalent to context.lineTo and SVG’s “lineto” command.

curve.lineStart() Indicates the start of a new line segment. Zero or more points will follow.

radialLine.context([context]) Equivalent to line.context.

d3.geoGilbert([type]) Gilbert’s two-world perspective projection. Wraps an instance of the specified projection type; if not specified, defaults to d3.geoOrthographic.