计算Z在X和Y之间的百分比位置

Question

Okay so if i have 3 values:

x = 0;
y = 100;
z = 50;

The position of z between x and y is 50% .

If z is 25 , the difference is 25% .

How can I work this out with javascript? I want my return value to be like 0.5 or 0.25

Thanks in advance from a first time StackOverflow user!

Answer 1

It's a simple mathematical formula, just use the floating point calculation:

position = (z - x) / (y - x)

That will get you the relative position (0 through 1) of z within the range x..y , assuming x <= z <= y and x < y . If you want a percentage, simply multiply by 100.