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La función Math.log() devuelve la base neutral de un número (base e)
La función en JavaScrcrip Math.log() es equivalente a ln(x) en matematicas.
function getBaseLog(x, y) {
return Math.log(y) / Math.log(x);
}
// 2 x 2 x 2 = 8
console.log(getBaseLog(2, 8));
// Expected output: 3
// 5 x 5 x 5 x 5 = 625
console.log(getBaseLog(5, 625));
// Expected output: 4
La base natural (base e) del número dado. Si el número es negativo, se devuelve NaN
If the value of x is negative, the return value is always NaN.
Because log() is a static method of Math, you always use it as Math.log(), rather than as a method of a Math object you created (Math is not a constructor).
If you need the natural log of 2 or 10, use the constants Math.LN2 or Math.LN10 . If you need a logarithm to base 2 or 10, use Math.log2() or Math.log10() . If you need a logarithm to other bases, use Math.log(x) / Math.log(otherBase) as in the example below; you might want to precalculate 1 / Math.log(otherBase) .
Math.log()
Math.log(-1); // NaN, out of range
Math.log(0); // -Infinity
Math.log(1); // 0
Math.log(10); // 2.302585092994046
Math.log() with a different base
The following function returns the logarithm of y with base x (ie. log x y \log_x y ):
function getBaseLog(x, y) {
return Math.log(y) / Math.log(x);
}
If you run getBaseLog(10, 1000) it returns 2.9999999999999996 due to floating-point rounding, which is very close to the actual answer of 3.
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