JavaScript Higher-Order Function

Taking a function as an argument:

function applyFunctionToArray(arr, fn) {

  const result = [];

  for (let i = 0; i < arr.length; i++) {

    result.push(fn(arr[i]));

  }

  return result;

}



const numbers = [1, 2, 3, 4, 5];



function double(x) {

  return x * 2;

}



const doubledNumbers = applyFunctionToArray(numbers, double);

console.log(doubledNumbers); // Output: [2, 4, 6, 8, 10]