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Array Reduce

Write a function named reduce that takes three arguments. arr (array) callback (function) accum (initial accumulation value)

Reduce arr to a single value by invoking the callback function with the accum value and each element in arr. The return value of each invocation of the callback will become the new accum value. The callback function is invoked with two arguments.

accum (anything) element (anything)

For example:

var result = reduce([1, 2, 3], function(accum, element) {
  return accum + element;
}, 0);

console.log(result); // 6