The toString() method returns a string representing the specified Number object.




Optional. An integer between 2 and 36 specifying the base to use for representing numeric values.

Errors thrown

If toString() is given a radix not between 2 and 36, a RangeError is thrown.


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 radixes 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.


Using toString

var count = 10;

console.log(count.toString());    // displays '10'
console.log((17).toString());     // displays '17'

var 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'

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