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Showing content from http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/log10 below:

Math.log10() - JavaScript | MDN

Math.log10()

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The Math.log10() static method returns the base 10 logarithm of a number. That is

∀ x > 0 , 𝙼𝚊𝚝𝚑.𝚕𝚘𝚐𝟷𝟶 ( 𝚡 ) = log 10 ( x ) = the unique  y  such that  10y = x \forall x > 0,\;\mathtt{\operatorname{Math.log10}(x)} = \log_{10}(x) = \text{the unique } y \text{ such that } 10^y = x Try it
console.log(Math.log10(100000));
// Expected output: 5

console.log(Math.log10(2));
// Expected output: 0.3010299956639812

console.log(Math.log10(1));
// Expected output: 0

console.log(Math.log10(0));
// Expected output: -Infinity
Syntax Parameters
x

A number greater than or equal to 0.

Return value

The base 10 logarithm of x. If x < 0, returns NaN.

Description

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); // NaN
Math.log10(-0); // -Infinity
Math.log10(0); // -Infinity
Math.log10(1); // 0
Math.log10(2); // 0.3010299956639812
Math.log10(100000); // 5
Math.log10(Infinity); // Infinity
Specifications Browser compatibility See also

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