Number.prototype.toFixed()

The toFixed() method formats a number using fixed-point notation.

Syntax

numObj.toFixed([digits])

Parameters

digits

Opcional. El número de digitos que aparecen después del punto decimal; este puede ser un valor entre 0 y 20, inclusive, algunas implementaciones pueden soportar un rango más amplio de valores. Si el argumento es omitido, es tratado como 0.

Return value

A string representing the given number using fixed-point notation.

Exceptions

RangeError

If digits is too small or too large. Values between 0 and 20, inclusive, will not cause a RangeError. Implementations are allowed to support larger and smaller values as well.

TypeError

If this method is invoked on an object that is not a Number.

Description

toFixed() returns a string representation of numObj that does not use exponential notation and has exactly digits digits after the decimal place. The number is rounded if necessary, and the fractional part is padded with zeros if necessary so that it has the specified length. If numObj is greater than 1e+21, this method simply calls Number.prototype.toString() and returns a string in exponential notation.

Examples

Using toFixed

var numObj = 12345.6789;

numObj.toFixed();       // Returns '12346': note rounding, no fractional part
numObj.toFixed(1);      // Returns '12345.7': note rounding
numObj.toFixed(6);      // Returns '12345.678900': note added zeros
(1.23e+20).toFixed(2);  // Returns '123000000000000000000.00'
(1.23e-10).toFixed(2);  // Returns '0.00'
2.34.toFixed(1);        // Returns '2.3'
2.35.toFixed(1);        // Returns '2.4'. Note that it rounds up in this case.
-2.34.toFixed(1);       // Returns -2.3 (due to operator precedence, negative number literals don't return a string...)
(-2.34).toFixed(1);     // Returns '-2.3' (...unless you use parentheses)

Specifications

Browser compatibility

See also

• Number.prototype.toExponential()
• Number.prototype.toPrecision()
• Number.prototype.toString()