Number.prototype.toFixed()
The toFixed()
method formats a number using fixed-point
notation.
Syntax
toFixed()
toFixed(digits)
Parameters
digits
Optional-
The number of digits to appear after the decimal point; this may be a value between
0
and20
, inclusive, and implementations may optionally support a larger range of values. If this argument is omitted, it is treated as0
.
Return value
A string representing the given number using fixed-point notation.
Exceptions
RangeError
-
If
digits
is too small or too large. Values between0
and100
, inclusive, will not cause aRangeError
. Implementations are allowed to support larger and smaller values as chosen. 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 the absolute value of numObj
is greater or
equal to 1e+21
, this method calls Number.prototype.toString()
and returns a string in exponential notation.
Warning: Floating point numbers cannot represent all decimals
precisely in binary. This can lead to unexpected results, such as
0.1 + 0.2 === 0.3
returning false
.
Examples
Using toFixed
let 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 it rounds up
2.55.toFixed(1) // Returns '2.5'. Note it rounds down - see warning above
-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'
Specifications
Specification |
---|
ECMAScript Language Specification # sec-number.prototype.tofixed |
Browser compatibility
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