d3.set([array[, accessor]]) Constructs a new set. If array is specified, adds the given array of string values to the returned set. The specified array may also be another set. An optional accessor function may be specified, which is equivalent to calling array.map(accessor) before constructing the set.

treemap.paddingBottom([padding]) If padding is specified, sets the bottom padding to the specified number or function and returns this treemap layout. If padding is not specified, returns the current bottom padding function, which defaults to the constant zero. If padding is a function, it is invoked for each node with children, being passed the current node. The bottom padding is used to separate the bottom edge of a node from its children.

d3.scaleSqrt() Constructs a new continuous power scale with the unit domain [0, 1], the unit range [0, 1], the exponent 0.5, the default interpolator and clamping disabled. This is a convenience method equivalent to d3.scalePow().exponent(0.5).

pie.padAngle([angle]) If angle is specified, sets the pad angle to the specified function or number and returns this pie generator. If angle is not specified, returns the current pad angle accessor, which defaults to: function padAngle() { return 0; } The pad angle here means the angular separation between each adjacent arc. The total amount of padding reserved is the specified angle times the number of elements in the input data array, and at most |endAngle - startAngle|; the remaining sp

d3.treemapSquarify(node, x0, y0, x1, y1) Implements the squarified treemap algorithm by Bruls et al., which seeks to produce rectangles of a given aspect ratio.

dispatch.apply(type[, that[, arguments]]) Like function.apply, invokes each registered callback for the specified type, passing the callback the specified arguments, with that as the this context. For example, if you wanted to dispatch your custom callbacks after handling a native click event, while preserving the current this context and arguments, you could say: selection.on("click", function() { dispatch.apply("custom", this, arguments); }); You can pass whatever arguments you want to c

arc.startAngle([angle]) If angle is specified, sets the start angle to the specified function or number and returns this arc generator. If angle is not specified, returns the current start angle accessor, which defaults to: function startAngle(d) { return d.startAngle; } The angle is specified in radians, with 0 at -y (12 o’clock) and positive angles proceeding clockwise. If |endAngle - startAngle| ≥ τ, a complete circle or annulus is generated rather than a sector.

selection.sort(compare) Returns a new selection that contains a copy of each group in this selection sorted according to the compare function. After sorting, re-inserts elements to match the resulting order (per selection.order). The compare function, which defaults to ascending, is passed two elements’ data a and b to compare. It should return either a negative, positive, or zero value. If negative, then a should be before b; if positive, then a should be after b; otherwise, a and b are con

y.strength([strength]) If strength is specified, sets the strength accessor to the specified number or function, re-evaluates the strength accessor for each node, and returns this force. The strength determines how much to increment the node’s y-velocity: (y - node.y) × strength. For example, a value of 0.1 indicates that the node should move a tenth of the way from its current y-position to the target y-position with each application. Higher values moves nodes more quickly to the target pos

d3.isoFormat The full ISO 8601 UTC time formatter. Where available, this method will use Date.toISOString to format.