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Properties of the BigInt Constructor

The value of the [[Prototype]] internal slot of the BigInt constructor is the intrinsic object %FunctionPrototype%.

The BigInt constructor has the following properties:

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BigInt.parseInt ( _string_, _radix_ )

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The `BigInt.parseInt` function produces an integer value dictated by interpretation of the contents of the _string_ argument according to the specified _radix_. Leading white space in _string_ is ignored. If _radix_ is *undefined* or 0, it is assumed to be 10 except when the number begins with the code unit pairs `0x` or `0X`, in which case a radix of 16 is assumed. If _radix_ is 16, the number may also optionally begin with the code unit pairs `0x` or `0X`.

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When the `BigInt.parseInt` function is called, the following steps are taken:

- - 1. Let _inputString_ be ? ToString(_string_). - 1. Let _S_ be a newly created substring of _inputString_ consisting of the first code unit that is not a |StrWhiteSpaceChar| and all code units following that code unit. (In other words, remove leading white space.) If _inputString_ does not contain any such code unit, let _S_ be the empty string. - 1. Let _sign_ be 1. - 1. If _S_ is not empty and the first code unit of _S_ is the code unit 0x002D (HYPHEN-MINUS), let _sign_ be -1. - 1. If _S_ is not empty and the first code unit of _S_ is the code unit 0x002B (PLUS SIGN) or the code unit 0x002D (HYPHEN-MINUS), remove the first code unit from _S_. - 1. Let _R_ be ? ToInt32(_radix_). - 1. Let _stripPrefix_ be *true*. - 1. If _R_ ≠ 0, then - 1. If _R_ < 2 or _R_ > 36, throw a *SyntaxError* exception. - 1. If _R_ ≠ 16, let _stripPrefix_ be *false*. - 1. Else _R_ = 0, - 1. Let _R_ be 10. - 1. If _stripPrefix_ is *true*, then - 1. If the length of _S_ is at least 2 and the first two code units of _S_ are either `"0x"` or `"0X"`, remove the first two code units from _S_ and let _R_ be 16. - 1. If _S_ contains a code unit that is not a radix-_R_ digit, let _Z_ be the substring of _S_ consisting of all code units before the first such code unit; otherwise, let _Z_ be _S_. - 1. If _Z_ is empty, throw a *SyntaxError* exception. - 1. Let _mathInt_ be the mathematical integer value that is represented by _Z_ in radix-_R_ notation, using the letters A-Z and a-z for digits with values 10 through 35. - 1. Let _number_ be _sign_ × _mathInt_. - 1. Return the BigInt value for _number_. - - -

`parseInt` may interpret only a leading portion of _string_ as an integer value; it ignores any code units that cannot be interpreted as part of the notation of an integer, and no indication is given that any such code units were ignored.

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BigInt.asUintN ( _bits_, _bigint_ )