Arranging Coins

LeetCode題目: 441. Arranging Coins

My solution:

/**
 * @param {number} n
 * @return {number}
 */
let arrangeCoins = n => {
    for(let i=1; i<=n; i++) {
        n -= i;
        if(n<i+1 || n === 0) return i;
    }
};