Math.log10()
The Math.log10()
function returns the base 10 logarithm
of a number, that is
Syntax
Math.log10(x)
Parameters
x
-
A number.
Return value
The base 10 logarithm of the given number. If the number is negative, NaN
is returned.
Description
If the value of x
is less than 0, the return value is always
NaN
.
Because log10()
is a static method of Math
, you always use it
as Math.log10()
, rather than as a method of a Math
object you
created (Math
is not a constructor).
This function is the equivalent of Math.log(x) / Math.log(10). For log10(e) use the
constant Math.LOG10E
which is 1 / Math.LN10
.
Examples
Using Math.log10()
Math.log10(2); // 0.3010299956639812
Math.log10(1); // 0
Math.log10(0); // -Infinity
Math.log10(-2); // NaN
Math.log10(100000); // 5
Polyfill
This can be emulated with the following function:
Math.log10 = Math.log10 || function(x) {
return Math.log(x) * Math.LOG10E;
};
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.log10 |
Browser compatibility
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