Doubt is in mathematics, a calculation that will be used in a program.
Let's say I have 3 items with different percentages:
Item 1 - 10%
Item 2 - 40%
Item 3 - 50%
I want to remove for example 10% of Item 3 and distribute this percentage in the other two proportionally, generating the following result:
Item 1 - 12%
Item 2 - 48%
Item 3 - 40%
Does anyone have any idea of the calculation or how do I get to this result?
Test like this:
var items = {
item1: 10,
item2: 40,
item3: 50
};
function distribuir(el, qtd) {
var somaTotal = 0,
nrItems = 0;
for (var este in items) {
if (items[el] != items[este]) {
somaTotal += items[este];
nrItems++;
}
}
for (var este in items) {
if (items[el] != items[este]) {
if (somaTotal == 0) items[este] += qtd / nrItems;
else items[este] += (items[este] || 1) * qtd / somaTotal;
} else items[este] -= qtd;
}
return items;
}
distribuir('item3', 10); // dá Object {item1: 12, item2: 48, item3: 40}