What is the best way to calculate the difference between two values? For example, if we have 0.0.0.1.0 and 0.0.0.1.12, the difference between them is 12. I attempted using Math.abs() but this only works for single digits.
What is the best way to calculate the difference between two values? For example, if we have 0.0.0.1.0 and 0.0.0.1.12, the difference between them is 12. I attempted using Math.abs() but this only works for single digits.
To address the possibility of the input being strings (as multiple full stops are not allowed in a valid JS number), one approach is to split the strings by the `.` character and then calculate the difference between each component:
function numStringDiff(a, b) {
// splitting the strings at dot characters
const aParts = a.split('.');
const bParts = b.split('.');
// iterating over the longest array length to compare components
return Array(Math.max(aParts.length, bParts.length)).fill(undefined).map((_, i) => {
const i1 = parseInt(aParts[i] || 0); // defaulting missing values to 0
const i2 = parseInt(bParts[i] || 0);
// calculating the difference after handling any missing values
return i2 - i1;
});
}
console.log(numStringDiff('0.0.0.1.0', '0.0.0.1.12'));The challenge arises when the lengths of the two arrays differ. In this case, it's essential to iterate over the longer array and compensate for missing items in the shorter array by defaulting them to a specific non-zero value like 0. This ensures that subtraction can be performed without disruptions.
In scenarios where the second argument has fewer dots than the first, a negative difference will result. Conversely, if the first string is longer, a positive difference will be returned.
Here are some sample comparisons:
numStringDiff('1.1.1', '1.1') // => [0, 0, -1]numStringDiff('1.1', '1.1.1') // => [0, 0, 1]numStringDiff('1.1.1', '1.1.1') // => [0, 0, 0]To obtain the absolute distance between the values, you can apply the .map function on the resulting array:
numStringDiff('1.1.1', '1.1').map(num => Math.abs(num));
// OR, using shorthand notation:
numStringDiff('1.1.1', '1.1').map(Math.abs);
If you require the result as a string, simply join the elements back with a dot using .join:
numStringDiff('1.1.1', '1.1').map(Math.abs).join('.');
It's important to understand your objective clearly. If you intend to parse version numbers manually (similar to semver versions), it may have limitations such as unhandled pre-release versions containing additional descriptors beyond digits. I recommend ensuring compatibility with all possible scenarios before relying solely on this function. The specific use case should guide your decision-making process :)
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