accumulator | value store limited by size or time | Key Value Database library

I need to create a slider for a game that you can set skills to each player,

The rules are :

1. Each skill starts at 0.
2. The skills cannot total more than 100 points at any time.
3. It should always be possible to assign any 0-100 value to a given skill. Given rule (2), if this gets us over 100 total points, the excess automatically, immediately, removed from the other skills, according to their current values.
4. It's not required to use all 100 points (or any).
5. A skill's value is always an integer.

For example :

• We start with:
  Stamina: 0 | Speed: 0 | Armor: 0 | Strength: 0 | Remaining: 100

• The player adds 50 Speed.
  Stamina: 0 | Speed: 50 | Armor: 0 | Strength: 0 | Remaining: 50

• The player adds 25 Armor.
  Stamina: 0 | Speed: 50 | Armor: 25 | Strength: 0 | Remaining: 25 - 115

• The player now adds 40 Stamina. The excess is automatically reduced from the other skills, weighted by their current values.
  Stamina: 40 | Speed: 40 | Armor: 20 | Strength: 0 | Remaining: 0

• The player then reduces Speed to 10.
  Stamina: 40 | Speed: 30 | Armor: 20 | Strength: 0 | Remaining: 10

• Finally, the player sets Strength to 100.
  Stamina: 0 | Speed: 0 | Armor: 0 | Strength: 100 | Remaining: 0

To do so i've created a function the receives 3 arguments :

1. An array of values of the slider

let arrToCalc = [14,24,55,0]

1. The index number of the skill (0 for Stamina, 1 for Speed ...etc)

let newValueIndex = 2

1. New value for base the calculation on

let newVal = 64.

Im not sure my calculations are accurate so i'm getting partial good results.

when set to

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