javascript callback functions

callback.js

//callback

const callback1 = (n) => {
  return n ** 2;
};

function cube(callback, n) {
  return callback1(n) * n;
}

//returning functions
const highOrder = (n) => {
  const doSomeThing = (m) => {
    const doWhatEver = (t) => {
      return 2 * n + 3 * m + t;
    };
    return doWhatEver;
  };
  return doSomeThing;
};

console.log(highOrder(2)(3)(10));

//returning function with callback

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

const sumArray = (arr) => {
  let sum = 0;
  const callBack = function (element) {
    sum += element;
  };
  arr.forEach(callBack);
  return sum;
};

console.log(sumArray(numbers))