js higher order functions

                                    // function that adds 2 numbers
function add(number1, number2){
	return number1 + number2;
}

// function that multiplies 2 numbers
function multiply(number1, number2){
	return number1 * number2;
}

// higher order function: takes 2 arguments and a function in this case
function calc(number1, number2, fn){
	return fn(number1, number2);
}

// this is how you would use it
calc(10, 2, add); // you can also use 'multiply' or any other function

// output: 12

                                    function copyArrayAndManipulate(array, instructions) {
  const output = []
  for(let i = 0; i < array.length; i++) {
    output.push(instructions(array[i]))
  }
  return output
}

function multiplyBy10(input) {
  return input * 10
}

copyArrayAndManipulate([1, 2, 3], multiplyBy10)