Function in ECMAScript 262

The object representing functions and methods.

Inherits from:

Object

Show inherited properties/methods?

Instance Properties

name	type	description
arguments	Array	An array of all parameters passed to the function/method.
constructor	Object	A reference to the constructor class for the current object instance. [from Object]
length	Number	(read only) The number of arguments declared with the function.
prototype	Object	The prototype for a class. [from Object]

Instance Methods

name	returns	description
apply([thisScope],[args])	Object	Call the function/method, optionally setting a new scope for `this` and passing in parameters via an array.
call([thisScope],[arg1],[arg2],…)	Object	Call the function/method, optionally setting a new scope for `this` and passing in parameters.
hasOwnProperty(propertyOrMethodName)	Boolean	Determines if the object/instance itself has the named property or method. [from Object]
isPrototypeOf(instanceToTest)	Boolean	Determines if the calling object prototype is in the inheritance chain for the supplied argument. [from Object]
propertyIsEnumerable(propertyOrMethodName)	Boolean	Determines if the object/instance itself has a property or method of the supplied name which will appear in a `for (prop in obj)` enumeration. [from Object]
toLocaleString()	String	For most objects, the same as `toString()` unless explicitly overridden. [from Object]
toString()	String	Returns a string representation of the object. [from Object]
valueOf()	String	Returns the internal `this` value of the object. [from Object]

Methods that return a Function

name	of object	description
ease(easingType,[easeParam1],[easeParam2])	d3	Retrieve a predefined easing function.

Arguments that are a Function

name	in method	of object	description
comparator	sort(comparator)	[d3] Selection	This function is passed two data elements a and b to compare, and must return either a negative number, positive number, or zero. If negative, then a should be before b; if positive, then a should be after b; if zero, a and b are considered equal and the order is arbitrary.
compareFunction	sort([compareFunction])	Array	The comparison function to use
dataCalculator	data(dataCalculator,[keyCalculator])	[d3] Selection
delayCalculator	delay(delayCalculator)	[d3] Transition	Invoked for each element in the transition selection, passed the element’s datum, index, and with the `this` context set to the element. The return value is set as the transition delay for the element, in milliseconds.
durationCalculator	duration(durationCalculator)	[d3] Transition	Invoked for each element in the transition selection, passed the element’s datum, index, and with the `this` context set to the element. The return value is set as the transition duration for the element, in milliseconds.
easingFunction	ease(easingFunction)	[d3] Transition
eventHandler	on(eventName,eventHandler,capturePhase)	[d3] Selection	Function to be invoked when the event occurs. Will be passed the datum for the current object, the index of that object in the selection, and with the `this` context set to the DOM element. To remove an event handler, pass `null` for this parameter.
func	each(func)	[d3] Selection	Invoked for each element in the selection, passed the datum and index, with the `this` context set to the DOM element.
func	property(name,func)	[d3] Selection	The function is evaluated for each selected element (in order), being passed the current datum `d` and the current index `i`, with the `this` context as the current DOM element. The function’s return value is then used to set each element’s property.
func	attr(name,func)	[d3] Transition	Invoked for each element in the transition selection, passed the current datum and index, with the `this` context as the current DOM element. The function’s return value is used to set each attribute’s value at the end of the transition. A `null` value will not remove the specified attribute.
func	call(func,[arg1],[arg2],…)	[d3] Transition	Invoked and passed the transition (and any additional arguments); the `this` context is also set to the transition.
func	each([type],func)	[d3] Transition	Invoked for each element in the seleciton, with parameters for the datum and index, and with the `this` context set to the DOM element.
func	classed(name,func)	[d3] Selection	The function is evaluated for each selected element (in order), being passed the current datum `d` and the current index `i`, with the `this` context as the current DOM element. The function’s return value is then used to assign or unassign the specified class on each element.
func	style(name,func,[priority])	[d3] Selection	The function is evaluated for each selected element (in order), being passed the current datum `d` and the current index `i`, with the `this` context as the current DOM element. The function’s return value is then used to set each element’s style property. A `null` value will remove the style property
func	text(func)	[d3] Selection	The function is evaluated for each selected element (in order), being passed the current datum `d` and the current index `i`, with the `this` context as the current DOM element. The function’s return value is then used to set each element’s text content. A `null` value will clear the content.
func	style(name,func,[priority])	[d3] Transition	Invoked for each element in the transition selection, passed the current datum and index, with the `this` context as the current DOM element. The function’s return value is used to set the element’s CSS property value at the end of the transition. A `null` value will not remove the specified style.
func	call(func,[arg1],[arg2],…)	[d3] Selection	Invoked and passed the selection (and any additional arguments); the `this` context is also set to the selection.
func	html(func)	[d3] Selection	The function is evaluated for each selected element (in order), being passed the current datum `d` and the current index `i`, with the `this` conhtml as the current DOM element. The function’s return value is then used to set each element’s html content. A `null` value will clear the content.
func	attr(name,func)	[d3] Selection	The function is evaluated for each selected element (in order), being passed the current datum `d` and the current index `i`, with the `this` context as the current DOM element. The function’s return value is then used to set each element’s attribute. A `null` value will remove the specified attribute.
func	text(func)	[d3] Transition	Invoked for each element in the transition selection, passed the current datum and index, with the `this` context as the current DOM element. The function’s return value is used to set the element’s `textContent` at the start of the transition. A `null` value will clear the content.
func	datum(func)	[d3] Selection	This function is invoked for each selected element, being passed the previous datum `d` and the current index `i`, with the `this` context as the current DOM element. The return value of this function is used to set each element’s data. A `null` value will delete the bound data.
keyCalculator	data(dataCalculator,[keyCalculator])	[d3] Selection	This function is yielded the values of the array and must return a unique string for each.
keyCalculator	data(dataValues,[keyCalculator])	[d3] Selection	This function is yielded the values of the array and must return a unique string for each.
selectCalculator	select(selectCalculator)	[d3] Selection	Invoked for each entry in the selection, with parameters for the current datum and index, and with the `this` context as the current DOM element. Must return either an element or `null`.
selectCalculator	selectAll(selectCalculator)	[d3] Selection	Invoked for each entry in the selection, with parameters for the current datum and index, and with the `this` context as the current DOM element. Must return either an array or `NodeList` (either of which may be empty).
tweenCalculator	attrTween(name,tweenCalculator)	[d3] Transition	Invoked for each element in the transition selection at the start of the transition, passed the current datum, index, and current (pre-transition) attribute value, with the `this` context as the current DOM element. This function must then return a tween interpolator function to use during the transition; the interpolator will be passed parameterized time in the domain `[0,1]` and must return the desired attribute value.
tweenCalculator	tween(name,tweenCalculator)	[d3] Transition	Invoked for each element in the transition selection at the start of the transition, passed the current datum, index, and current (pre-transition) attribute value, with the `this` context as the current DOM element. This function must then return a tween interpolator function to use during the transition; the interpolator will be passed parameterized time in the domain `[0,1]` with the `this` context set to DOM element, and must do whatever is necessary to accomplish the tween.
tweenCalculator	styleTween(name,tweenCalculator,[priority])	[d3] Transition	Invoked for each element in the transition selection at the start of the transition, passed the current datum, index, and current (pre-transition) calculated CSS value, with the `this` context as the current DOM element. This function must then return a tween interpolator function to use during the transition; the interpolator will be passed parameterized time in the domain `[0,1]` and must return the desired CSS style value.