Obtain the following ten years following a specified value

Seeking the optimal method to determine the next decade after a given value in Javascript. For instance:

If the value is 9, the next decade would be 10^1
For 200 it would be 10^3
And for 1001, it would be 10^4

This algorithm should also cater for negative numbers:

With -9, the next decade would be -10^1
For 200, it would be -10^3
And for 1001, it would be -10^4

The term "decade" may have been inaccurately used here. Basically, what I need is the next whole number that can be expressed as a power of 10. For example, for 9, that's 10^1. And for 200, that's 10^3 since 10^2 is less than 200...

javascript

Answer №1

To calculate the power of 10 for a given integer value, you can use the logarithm of 10 and add one to the result. It's important to consider the sign of the integer beforehand.

console.log([9, 200, 1001, -9].map(v => (v >= 0 || -1) * Math.pow(10, 1 + Math.floor(Math.log10(Math.abs(v))))));

Answer №2

To determine the power of 10 you need, simply take the ceiling of the logarithm in base 10:

function findPowerOfTen(number) {
  return (number > 0) ? Math.pow(10, Math.ceil(Math.log10(number))) :
                        -1 * Math.pow(10, Math.ceil(Math.log10(number * -1)));
}

console.log(findPowerOfTen(9));
console.log(findPowerOfTen(200));
console.log(findPowerOfTen(1001));
console.log(findPowerOfTen(-9));
console.log(findPowerOfTen(-200));
console.log(findPowerOfTen(-1001));

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