Beginner Exercism • javascript

Accumulate

Challenge Overview

Implement the `accumulate` operation, which, given a collection and an operation to perform on each element of the collection, returns a new collection containing the result of applying that operat...

Instructions

Implement the accumulate operation, which, given a collection and an operation to perform on each element of the collection, returns a new collection containing the result of applying that operation to each element of the input collection.

Given the collection of numbers:

1, 2, 3, 4, 5

And the operation:

square a number (x => x * x)

Your code should be able to produce the collection of squares:

1, 4, 9, 16, 25

Check out the test suite to see the expected function signature.

Restrictions

Keep your hands off that collect/map/fmap/whatchamacallit functionality provided by your standard library! Solve this one yourself using other basic tools instead.

Source: Exercism javascript/accumulate

💡 View Solution

export const accumulate = (array, accumulator) => {
  const result = [];
  for (const element of array) {
    result.push(accumulator(element));
  }
  return result;
};