takeUntil.js

//const variable defined with an anonymous function

const takeUntil = function(array, callback) {
  const results []; //empty array to store future results
  for (let element of array) { //loop
    if (callback(element)) { // calling callback function, passing element
      return results; //exit loop - give result of array
    }
    results.push(element); //push elements of array
  }
  return results;
}

const eqArrays = function (array1, array2) {
  if (array1.length !== array2.length) {
    return false;
  }
  for (let i = 0; i < array1.length; i++) {
    if (array1[i] !== array2[i]) {
      return false;
    }
  }
  return true;
};

const assertArraysEqual = function (actual, expected) {
  if (eqArrays(actual, expected)) {
    console.log(`✅ Assertion Passed: ${actual} === ${expected}`);
  } else {
    console.log(`🛑 Assertion Failed: ${actual} !== ${expected}`);
  }
};

// Test cases
assertArraysEqual(takeUntil(data1, x => x < 0), [1, 2, 5, 7, 2]);
assertArraysEqual(takeUntil(data2, x => x === ','), ["I've", "been", "to", "Hollywood"])