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var a = [2, 3, 2, 4];
var b = a.map(function(e, i, a) {
  return multiply(i, a);
});

function multiply(_i, a) {
  var sum = 1;
  a.forEach(function(e, i) {
    if (_i === i) return;
    sum = sum * e;
  })
  return sum;
}
console.log(b);