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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 equvalent 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 | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.log10' in that specification. |
Standard | Initial definition. |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.log10' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 38 | 25 (25) | Edge | 25 | 7.1 |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | No support | 25.0 (25) | No support | No support | 8 |
See also
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