local.toString() Returns the automatically-generated identifier for this local. This is the name of the property that is used to store the local’s value on elements, and thus you can also set or get the local’s value using element[local] or by using selection.property.

healpix.lobes([lobes]) If lobes is specified, sets the number of lobes (the parameter H in the literature) and returns this projection. If lobes is not specified, returns the current lobe number, which defaults to 4.

node.eachAfter(function) Invokes the specified function for node and each descendant in post-order traversal, such that a given node is only visited after all of its descendants have already been visited. The specified function is passed the current node.

arc.context([context]) If context is specified, sets the context and returns this arc generator. If context is not specified, returns the current context, which defaults to null. If the context is not null, then the generated arc is rendered to this context as a sequence of path method calls. Otherwise, a path data string representing the generated arc is returned.

band.round([round]) If round is specified, enables or disables rounding accordingly. If rounding is enabled, the start and stop of each band will be integers. Rounding is sometimes useful for avoiding antialiasing artifacts, though also consider the shape-rendering “crispEdges” styles. Note that if the width of the domain is not a multiple of the cardinality of the range, there may be leftover unused space, even without padding! Use band.align to specify how the leftover space is distributed

selection.select(selector) For each selected element, selects the first descendant element that matches the specified selector string. If no element matches the specified selector for the current element, the element at the current index will be null in the returned selection. (If the selector is null, every element in the returned selection will be null, resulting in an empty selection.) If the current element has associated data, this data is propagated to the corresponding selected elemen

transition.merge(other) Returns a new transition merging this transition with the specified other transition, which must have the same id as this transition. The returned transition has the same number of groups, the same parents, the same name and the same id as this transition. Any missing (null) elements in this transition are filled with the corresponding element, if present (not null), from the other transition. This method is equivalent to deriving the selection for this transition via

axis.tickValues([values]) If a values array is specified, the specified values are used for ticks rather than using the scale’s automatic tick generator. If values is null, clears any previously-set explicit tick values and reverts back to the scale’s tick generator. If values is not specified, returns the current tick values, which defaults to null. For example, to generate ticks at specific values: var xAxis = d3.axisBottom(x) .tickValues([1, 2, 3, 5, 8, 13, 21]); The explicit tick val

interval.range(start, stop[, step]) Returns every an array of dates representing every interval boundary after or equal to start (inclusive) and before stop (exclusive). If step is specified, then every stepth boundary will be returned; for example, for the timeDay interval a step of 2 will return every other day. If step is not an integer, it is floored. The first date in the returned array is the earliest boundary after or equal to start; subsequent dates are offset by step intervals and f

d3.geoDistance(a, b) Returns the great-arc distance in radians between the two points a and b. Each point must be specified as a two-element array [longitude, latitude] in degrees.