joeytwiddle

Do not use forEach with async-await

TLDR: Use for...of instead of forEach() in asynchronous code.

For legacy browsers, use for...i or [].reduce()

To execute the promises in parallel, use Promise.all([].map(...))

The problem

olaferlandsen

/**
*
*   boolean isEmpty ( value )
*
*   Example:
*
*   var a = null;
*   if (isEmpty(a)) {
*       alert ('empty variable');
*   }

mogelbrod

function weightedChoice(weights) {
  const weightSum = weights.reduce((sum, w) => sum + w)
  let choice = Math.floor(Math.random() * weightSum) + 1
  let idx = weights.length - 1
  while ((choice -= weights[idx]) > 0) {
    idx -= 1
  }
  return idx
}