problem.md

Task

Use Array#reduce to implement a simple version of Array#map.

Expected Output

A function map that applies a function to each item in an array and collects the results in a new Array.

var nums = [1,2,3,4,5]

// `map` is your exported function
var output = map(nums, function double(item) {
  return item * 2
})

console.log(output) // => [2,4,6,8,10]

Arguments

• input: an arbitrary Array of any type.
• operation: an arbitrary Function which can be applied to items in input.

Hints

• No need to implement the optional thisArg argument of Array.prototype.map, bonus points if you do!

Resources

• https://en.wikipedia.org/wiki/Reduce_(higher-order_function)
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

Boilerplate

function arrayMap(arr, fn, thisArg) {
  //SOLUTION GOES HERE
}

module.exports = arrayMap;