Simple solutions of lucky draw.

$ npm install jammi

The most common method with setting probability.

• prizes:

[
  {
    id: '61f55251-3b9c-498e-bbbe-c730de62a38d' // id of prize
    probability: 0.35 // probability of prize
  }

  ...
]

Return id or null.

Prize are threw into a imaginary pool. Every can get a prize when his / her hand reach the pool.

• prizes:

[
  {
    id: '61f55251-3b9c-498e-bbbe-c730de62a38d' // id of prize
    balance: 124 // balance of prize
  }

  ...
]

Return id or null.

Prizes are distributed on timeline between startTime to endTime. This method gains best effect of marketing.

• prizes:

[
  {
    id: '61f55251-3b9c-498e-bbbe-c730de62a38d' // id of prize
    sum: 200 // sum of prize, including those which have been issued
    balance: 124 // balance of prize
  }
  ...
]

• startTime: the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC.
• endTime: the number of milliseconds elapsed since 1 January 1970 00:00:00 UTC.

Return id or null.

Made with ❤ by m31271n