Built-in function objects that are not identified as constructors do not implement the [[Construct]] internal method unless otherwise specified in the description of a particular function.
Built-in function objects that are not constructors do not have a *"prototype"* property unless otherwise specified in the description of a particular function.
Each built-in function defined in this specification is created by calling the CreateBuiltinFunction abstract operation (
Every built-in function object, including constructors, has a *"length"* property whose value is a non-negative integral Number. Unless otherwise specified, this value is the number of required parameters shown in the subclause heading for the function description. Optional parameters and rest parameters are not included in the parameter count.
+Every built-in function object, including constructors, has a *"length"* property whose value is a non-negative integral Number. Unless otherwise specified, this value is the number of required parameters shown in the subclause heading for the function description. Optional parameters and rest parameters are not included in the parameter count. For built-in get accessor functions the value is always *+0*𝔽. For built-in set accessor functions the value is always *1*𝔽.
For example, the function object that is the initial value of the *"map"* property of the Array prototype object is described under the subclause heading «Array.prototype.map (callback [ , thisArg])» which shows the two named arguments callback and thisArg, the latter being optional; therefore the value of the *"length"* property of that function object is *1*𝔽.
`Object.prototype.__proto__` is an accessor property with attributes { [[Enumerable]]: *false*, [[Configurable]]: *true* }. The [[Get]] and [[Set]] attributes are defined as follows:
The value of the [[Get]] attribute is a built-in function that requires no arguments. It performs the following steps when called:
+The value of the [[Get]] attribute is a built-in function that performs the following steps when called:
The value of the [[Set]] attribute is a built-in function that takes an argument _proto_. It performs the following steps when called:
+The value of the [[Set]] attribute is a built-in function that performs the following steps when called:
`Symbol.prototype.description` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp[%Symbol.species%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.dotAll` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.flags` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.global` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.hasIndices` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.ignoreCase` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.multiline` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.source` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.sticky` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.unicode` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`RegExp.prototype.unicodeSets` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`Array[%Symbol.species%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
%TypedArray%`[%Symbol.species%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
%TypedArray%`.prototype.buffer` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
%TypedArray%`.prototype.byteLength` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
%TypedArray%`.prototype.byteOffset` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
%TypedArray%`.prototype.length` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
%TypedArray%`.prototype[%Symbol.toStringTag%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`Map[%Symbol.species%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`Map.prototype.size` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`Set[%Symbol.species%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`Set.prototype.size` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`ArrayBuffer[%Symbol.species%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`ArrayBuffer.prototype.byteLength` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`ArrayBuffer.prototype.detached` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`ArrayBuffer.prototype.maxByteLength` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`ArrayBuffer.prototype.resizable` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`SharedArrayBuffer[%Symbol.species%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`SharedArrayBuffer.prototype.byteLength` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`SharedArrayBuffer.prototype.growable` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`SharedArrayBuffer.prototype.maxByteLength` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`DataView.prototype.buffer` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`DataView.prototype.byteLength` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`DataView.prototype.byteOffset` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called:
`Iterator.prototype.constructor` is an accessor property with attributes { [[Enumerable]]: *false*, [[Configurable]]: *true* }. The [[Get]] and [[Set]] attributes are defined as follows:
The value of the [[Get]] attribute is a built-in function that requires no arguments. It performs the following steps when called:
+The value of the [[Get]] attribute is a built-in function that performs the following steps when called:
The value of the [[Set]] attribute is a built-in function that takes an argument _v_. It performs the following steps when called:
+The value of the [[Set]] attribute is a built-in function that performs the following steps when called:
`Iterator.prototype[%Symbol.toStringTag%]` is an accessor property with attributes { [[Enumerable]]: *false*, [[Configurable]]: *true* }. The [[Get]] and [[Set]] attributes are defined as follows:
The value of the [[Get]] attribute is a built-in function that requires no arguments. It performs the following steps when called:
+The value of the [[Get]] attribute is a built-in function that performs the following steps when called:
The value of the [[Set]] attribute is a built-in function that takes an argument _v_. It performs the following steps when called:
+The value of the [[Set]] attribute is a built-in function that performs the following steps when called:
`Promise[%Symbol.species%]` is an accessor property whose set accessor function is *undefined*. Its get accessor function performs the following steps when called: