freeCodeCamp Intermediate Algorithm Scripting: Drop it

dropElements.js

// Given the array arr, iterate through and remove each element 
// starting from the first element (the 0 index) until the function 
// func returns true when the iterated element is passed through it.

// Then return the rest of the array once the condition is satisfied, 
// otherwise, arr should be returned as an empty array.

// Cannot use filter, since we need to return the rest of the array
// once the condition is met. We use a 'For' loop !

function dropElements(arr, func) {
  // Drop them elements.
  let myArr=[];
  for (let i=0; i<arr.length; i++) {
    if (func(arr[i])) {
      myArr=arr.slice(i);
      break;
    }
  }
  return myArr;
}

dropElements([1, 2, 3], function(n) {return n < 3; }); // [1,2]
dropElements([1, 2, 3, 4], function(n) {return n >= 3;}) // [3,4]
dropElements([0, 1, 0, 1], function(n) {return n === 1;}); // [1, 0, 1]
dropElements([1, 2, 3], function(n) {return n > 0;}); // [1, 2, 3]
dropElements([1, 2, 3, 4], function(n) {return n > 5;}); // []
dropElements([1, 2, 3, 7, 4], function(n) {return n > 3;}); // [7, 4]
dropElements([1, 2, 3, 9, 2], function(n) {return n > 2;}); // [3, 9, 2]

function dropElements(arr, func) {
  let index;
  for (let count in arr) {
    if (func(arr[count])) {
      index = count;
      break;
    }
  }

  return index ? arr.slice(index) : [];
}