CF rough chance calculations

let chanceToRoll = [0.074409,   0.101869,   0.165654,   0.275538,   0.030763,   0.330264, 0,    0.021503];

let nothingObtained = [0, 0, 0, 0, 0, 0, 0, 0];

function equals (a, b) {
    for (let i = 0; i < 8; ++i)
    {
        if (a[i] != b[i]) return false;
    }
    return true;
}

function available(state, total) {
    let available = total;
    for (let i = 0; i < 8; ++i)
    {
        available -= (i + 1) * state[i];
    }
    return available;
}

function addToData(currentData, pair) {
    for (let index = 0; index < currentData.length; ++index) {
        if (equals(currentData[index][0], pair[0])) {
            currentData[index][1] += pair[1];
            return;
        }
    }
    currentData.push(pair);
}

function calculate(startingPoints, runUntil, rank) {
    let data = [[nothingObtained, 1]];
    for (let total = startingPoints + 1; total <= runUntil; total++) {
        let newData = [];
        for(let pair of data) {
            let state = pair[0];
            let baseChance = pair[1];
            let toSpend = available(pair[0], total);
            for (let index = 0; index < toSpend; index++) {
                let newState = pair[0].slice(0, 8);
                newState[index]++;
                addToData(newData, [newState, baseChance * chanceToRoll[index]]);
            }
            let chanceToMiss = baseChance * chanceToRoll.slice(toSpend, 8).reduce((a, b) => a+b, 0);
            if (chanceToMiss > 0) {
                addToData(newData, [state, chanceToMiss]);
            }
        }
        data = newData;
    }
    let chanceToObtain = 0;
    for(let pair of data) {
        let state = pair[0];
        let chance = pair[1];
        if (state[rank - 1] > 0) {
            chanceToObtain += chance;
        }
    }
    return chanceToObtain;
}

function makeTable(startingPoints, rolls) {
    const output = [];
    for (let roll = 1; roll <= rolls; roll++) {
        for (let rank = 1; rank <= 8; ++rank) {
            output.push(calculate(startingPoints, startingPoints + roll, rank) + '\t');
        }
        output.push('\n');
    }
    return output.join('');
}