takeUntil.js

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

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

//takeUntil function will take in two parameters (the array, and the callback) and will return a slice of the array with elements taken from the beginning

const takeUntil = function(array, callback) {
  const results = []; //store results in empty object
  for (let item of array) { //loop through each item in the array
    if(!callback(item)) { //while looping through the array, if the item is != to callback function
      results.push(item); //push the item into our results
    } else {
      break; //if the item matches the callback function, break out of the loop
    }
  }
  return results;
}

module.exports = takeUntil;

const data1 = [1, 2, 5, 7, 2, -1, 2, 4, 5];
const results1 = takeUntil(data1, x => x < 0);
console.log(results1);

console.log('---');

const data2 = ["I've", "been", "to", "Hollywood", ",", "I've", "been", "to", "Redwood"];
const results2 = takeUntil(data2, x => x === ',');
console.log(results2);