Interface NumberConstructor

interface NumberConstructor {
    new NumberConstructornew (value?): Number;
    EPSILON: number;
    MAX_SAFE_INTEGER: number;
    MAX_VALUE: number;
    MIN_SAFE_INTEGER: number;
    MIN_VALUE: number;
    NEGATIVE_INFINITY: number;
    NaN: number;
    POSITIVE_INFINITY: number;
    prototype: Number;
    isFinite(number): boolean;
    isInteger(number): boolean;
    isNaN(number): boolean;
    isSafeInteger(number): boolean;
    is_number(n): boolean;
    parseFloat(string): number;
    parseInt(string, radix?): number;
    (value?): number;
}
  • NumberConstructor(value?): number

  • Parameters

    • Optional value: any

    Returns number

Constructors

constructor

Properties

EPSILON MAX_SAFE_INTEGER MAX_VALUE MIN_SAFE_INTEGER MIN_VALUE NEGATIVE_INFINITY NaN POSITIVE_INFINITY prototype

Methods

isFinite isInteger isNaN isSafeInteger is_number parseFloat parseInt

Constructors

constructor

  • new NumberConstructor(value?): Number

  • Parameters

    • Optional value: any

    Returns Number

Properties

Readonly EPSILON

EPSILON: number

The value of Number.EPSILON is the difference between 1 and the smallest value greater than 1 that is representable as a Number value, which is approximately: 2.2204460492503130808472633361816 x 10‍−‍16.

Readonly MAX_SAFE_INTEGER

MAX_SAFE_INTEGER: number

The value of the largest integer n such that n and n + 1 are both exactly representable as a Number value. The value of Number.MAX_SAFE_INTEGER is 9007199254740991 2^53 − 1.

Readonly MAX_VALUE

MAX_VALUE: number

The largest number that can be represented in JavaScript. Equal to approximately 1.79E+308.

Readonly MIN_SAFE_INTEGER

MIN_SAFE_INTEGER: number

The value of the smallest integer n such that n and n − 1 are both exactly representable as a Number value. The value of Number.MIN_SAFE_INTEGER is −9007199254740991 (−(2^53 − 1)).

Readonly MIN_VALUE

MIN_VALUE: number

The closest number to zero that can be represented in JavaScript. Equal to approximately 5.00E-324.

Readonly NEGATIVE_INFINITY

NEGATIVE_INFINITY: number

A value that is less than the largest negative number that can be represented in JavaScript. JavaScript displays NEGATIVE_INFINITY values as -infinity.

Readonly NaN

NaN: number

A value that is not a number. In equality comparisons, NaN does not equal any value, including itself. To test whether a value is equivalent to NaN, use the isNaN function.

Readonly POSITIVE_INFINITY

POSITIVE_INFINITY: number

A value greater than the largest number that can be represented in JavaScript. JavaScript displays POSITIVE_INFINITY values as infinity.

Readonly prototype

prototype: Number

Methods

isFinite

  • isFinite(number): boolean

  • Returns true if passed value is finite. Unlike the global isFinite, Number.isFinite doesn't forcibly convert the parameter to a number. Only finite values of the type number, result in true.

    Parameters

    • number: unknown

      A numeric value.

    Returns boolean

isInteger

  • isInteger(number): boolean

  • Returns true if the value passed is an integer, false otherwise.

    Parameters

    • number: unknown

      A numeric value.

    Returns boolean

isNaN

  • isNaN(number): boolean

  • Returns a Boolean value that indicates whether a value is the reserved value NaN (not a number). Unlike the global isNaN(), Number.isNaN() doesn't forcefully convert the parameter to a number. Only values of the type number, that are also NaN, result in true.

    Parameters

    • number: unknown

      A numeric value.

    Returns boolean

isSafeInteger

  • isSafeInteger(number): boolean

  • Returns true if the value passed is a safe integer.

    Parameters

    • number: unknown

      A numeric value.

    Returns boolean

is_number

  • is_number(n): boolean

  • 渡された文字列が数値かどうかを判断する ( 小数でも true を返す )

    Parameters

    • n: string

      判断する値

    Returns boolean

    渡された値が数値であれば true を返す

parseFloat

  • parseFloat(string): number

  • Converts a string to a floating-point number.

    Parameters

    • string: string

      A string that contains a floating-point number.

    Returns number

parseInt

  • parseInt(string, radix?): number

  • Converts A string to an integer.

    Parameters

    • string: string

      A string to convert into a number.

    • Optional radix: number

      A value between 2 and 36 that specifies the base of the number in string. If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal. All other strings are considered decimal.

    Returns number

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