takeUntil.js

// FUNCTION IMPLEMENTATION
// Takes from an array until the callback funcion is true, then returns the array up to that point
const takeUntil = function(array, callback) {
  const results = [];
  for (let item of array) {
    if (callback(item)) {
      return results;
    } else {
      results.push(item);
    }
  }
  return results;
}

module.exports = takeUntil;

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

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

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


const data2 = ["I've", "been", "to", "Hollywood", ",", "I've", "been", "to", "Redwood"];
const results2 = takeUntil(data2, x => x === ',');
assertArraysEqual(results2, ["I've", "been", "to", "Hollywood" ]);
*/