quadtree.remove(datum) Removes the specified datum to the quadtree, deriving its coordinates ⟨x,y⟩ using the current x- and y-accessors, and returns the quadtree. If the specified datum does not exist in this quadtree, this method does nothing.

nest.key(key) Registers a new key function. The key function will be invoked for each element in the input array and must return a string identifier to assign the element to its group. Most often, the function is a simple accessor, such as the year and variety accessors above. (Keys functions are not passed the input array index.) Each time a key is registered, it is pushed onto the end of the internal array of keys, and the nest operator applies an additional level of nesting.

d3.zoomIdentity The identity transform, where k = 1, tx = ty = 0.

tsv2json [options…] [file] Equivalent to dsv2json, but the input delimiter defaults to the tab character (\t).

set.empty() Returns true if and only if this set has zero values.

line(data) Generates a line for the given array of data. Depending on this line generator’s associated curve, the given input data may need to be sorted by x-value before being passed to the line generator. If the line generator has a context, then the line is rendered to this context as a sequence of path method calls and this function returns void. Otherwise, a path data string is returned.

d3.curveCatmullRomClosed(context) Produces a closed cubic Catmull–Rom spline using the specified control points and the parameter alpha, which defaults to 0.5, as proposed by Yuksel et al. When a line segment ends, the first three control points are repeated, producing a closed loop.

d3.timeSecond d3.utcSecond Seconds (e.g., 01:23:45.0000 AM); 1,000 milliseconds.

local.remove(node) Deletes this local’s value from the specified node and returns its previous value. Returns true if the node defined this local prior to removal, and false otherwise. If ancestors also define this local, those definitions are unaffected, and thus local.get will still return the inherited value.

tree.nodeSize([size]) If size is specified, sets this tree layout’s node size to the specified two-element array of numbers [width, height] and returns this tree layout. If size is not specified, returns the current node size, which defaults to null. A node size of null indicates that a layout size will be used instead. When a node size is specified, the root node is always positioned at ⟨0, 0⟩.