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

Math.log10(2);      // 0.3010299956639812
Math.log10(1);      // 0
Math.log10(0);      // -Infinity
Math.log10(-2);     // NaN
Math.log10(100000); // 5