Number.prototype.toString()
The toString()
method returns a string representing the
specified Number
object.
Syntax
toString()
toString(radix)
Parameters
radix
Optional-
An integer in the range
2
through36
specifying the base to use for representing numeric values.
Return value
A string representing the specified Number
object.
Exceptions
RangeError
-
If
toString()
is given aradix
less than2
or greater than36
, aRangeError
is thrown.
Description
The Number
object overrides the toString()
method of the
Object
object. (It does not inherit
Object.prototype.toString()
). For Number
objects, the
toString()
method returns a string representation of the object in the
specified radix.
The toString()
method parses its first argument, and attempts to return a
string representation in the specified radix
(base). For radices
above 10
, the letters of the alphabet indicate numerals greater than 9. For
example, for hexadecimal numbers (base 16), a
through f
are
used.
If the radix
is not specified, the preferred radix is assumed
to be 10
.
If the numObj
is negative, the sign is preserved. This is the
case even if the radix is 2
; the string returned is the positive binary
representation of the numObj
preceded by a -
sign,
not the two's complement of the numObj
.
If the numObj
is not a whole number, the 'dot' sign is used to
separate the decimal places.
Examples
Using toString
let count = 10
console.log(count.toString()) // displays '10'
console.log((17).toString()) // displays '17'
console.log((17.2).toString()) // displays '17.2'
let x = 6
console.log(x.toString(2)) // displays '110'
console.log((254).toString(16)) // displays 'fe'
console.log((-10).toString(2)) // displays '-1010'
console.log((-0xff).toString(2)) // displays '-11111111'
Specifications
Specification |
---|
ECMAScript Language Specification # sec-number.prototype.tostring |
Browser compatibility
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